What's odd?

adjective

1. differing in nature from what is ordinary, usual, or expected: an odd choice.

2. singular or peculiar in a strange or eccentric way: an odd person; odd manners.

3. fantastic; bizarre: Her taste in clothing was rather odd.

4. leaving a remainder of 1 when divided by 2, as a number (opposed to even ): Numbers like 3, 15, and 181 are odd numbers.

5. more or less, especially a little more (used in combination with a round number): I owe three hundred-odd dollars.

6. being a small amount in addition to what is counted or specified: I have five gross and a few odd dozens.

7. being part of a pair, set, or series of which the rest is lacking: an odd glove.

8. remaining after all others are paired, grouped, or divided into equal numbers or parts: Everybody gets two hamburgers and I get the odd one.

9. left over after all others are used, consumed, etc.

10. (of a pair) not matching: Do you know you're wearing an odd pair of socks?

11. not forming part of any particular group, set, or class: to pick up odd bits of information.

12. not regular, usual, or full-time; occasional; casual: odd jobs.

13. out-of-the-way; secluded: a tour to the odd parts of the Far East.

14. Mathematics . (of a function) having a sign that changes when the sign of each independent variable is changed at the same time.

noun

15. something that is odd.

16. Golf.
  a. a stroke more than the opponent has played.
  b. British . a stroke taken from a player's total score for a hole in order to give him or her odds.

Related forms

odder (comparative adjective)
oddest (superlative adjective)
oddly (adverb)
oddness (noun)

Odd - Adjective Synonyms

Definition:     miscellaneous, various
Synonyms:     accidental, casual, chance, contingent, different, fluky, fortuitous, fragmentary, incidental, irregular, occasional, odd-lot, periodic, random, seasonal, sundry, varied

Definition:     single, unmatched; uneven
Synonyms:     additional, alone, exceeding, individual, irregular, left, leftover, lone, lonely, over, over and above, remaining, singular, sole, solitary, spare, surplus, unconsumed, unitary, unpaired

Definition:     unusual, abnormal
Synonyms:     atypical, avant-garde, bizarre, character, crazy, curious, deviant, different, eccentric, erratic, exceptional, extraordinary, fantastic, flaky, freak, freakish, freaky, funny, idiosyncratic, irregular, kinky, kooky, off-the-wall, offbeat, out of the ordinary, outlandish, peculiar, quaint, queer, rare, remarkable, singular, spacey, strange, uncanny, uncommon, unconventional, unique, way out, weird, weirdo, whimsical

Definition:     not normal; varying from the usual
Synonyms:     abnormal, atypical, bizarre, deviant, different, flaky, mental, nonstandard, odd, off-base, off-color, out of line, peculiar, psycho, strange, unusual, weird

Definition:     different from standard or norm
Synonyms:     aberrant, anomalistic, anomalous, atypical, bizarre, curious, deviant, deviate, deviating, divergent, eccentric, exceptional, extraordinary, fantastic, funny, grody, gross, heteroclite, heterodox, heteromorphic, irregular, odd, off-base, off-color, out of line, peculiar, preternatural, queer, screwy, spastic, strange, uncommon, unexpected, unnatural, unorthodox, unusual, weird

Definition:     deviating from normal, usual
Synonyms:     aberrant, abnormal, atypical, bizarre, divergent, eccentric, exceptional, foreign, heteroclite, incongruous, inconsistent, irregular, odd, peculiar, preternatural, prodigious, rare, strange, unnatural, unorthodox, unrepresentative, untypical, unusual

Definition:     nonconforming
Synonyms:     aberrant, abnormal, anomalous, deviant, different, divergent, exceptional, heteroclite, irregular, odd, peculiar, preternatural, strange, unnatural, unrepresentative

Oddly - Adverb Synonyms

Definition:     curiously
Synonyms:     inexplicably, peculiarly, queerly, ridiculously, strangely, unusually

Definition:     exceptionally, particularly
Synonyms:     abnormally, above all, before all else, chiefly, conspicuously, curiously, eminently, exclusively, expressly, extraordinarily, in particular, in specie, mainly, markedly, notably, oddly , outstandingly, peculiarly, preeminently, primarily, principally, remarkably, signally, singularly, specially, specifically, strangely, strikingly, supremely, unaccountably, uncommonly, uncustomarily, uniquely, unusually, wonderfully

Definition:     infrequently
Synonyms:     exceptionally, extra, extremely, hardly ever, in few instances, irregularly, not often, now and then, occasionally, oddly , on occasion, particularly, peculiarly, rarely, remarkably, scarcely ever, seldom, sporadically, strangely, unusually, very

Definition:     extremely
Synonyms:     almighty, awful, awfully, curiously, especially, extra, extraordinarily, mighty, oddly , peculiarly, plenty, powerful, rarely, real, really, remarkably, right, so, so much, strangely, surprisingly, terribly, terrifically, too much, uncommon, uncommonly, very

Definition:     unusually
Synonyms:     almighty, awful, awfully, curiously, especially, exceptionally, extra, extraordinarily, mighty, oddly , peculiarly, plenty, powerful, rarely, real, really, right, singularly, so, so much, strangely, surprisingly, terribly, terrifically, too much, uncommon, uncommonly, very

Oddness - Noun Synonyms

Definition:     bizarreness, unusualness
Synonyms:     aberration, abnormality, anomaly, caprice, capriciousness, foible, freakishness, hereticism, idiocrasy, idiosyncrasy, irregularity, kink, nonconformity, oddity, oddness , outlandishness, peculiarity, queerness, quirk, singularity, strangeness, unconventionality, unorthodoxness, waywardness, weirdness, whimsicality, whimsicalness

Definition:     peculiarity of how someone behaves, acts
Synonyms:     affectation, air, characteristic, eccentricity, foible, habit, idiosyncrasy, oddness , pose, pretension, queerness, quirk, singularity, trait, trick

Definition:     abnormality
Synonyms:     anomaly, bizarreness, characteristic, conversation piece, curiosity, eccentricity, extraordinariness, freak, freakishness, idiosyncrasy, incongruity, irregularity, kink, oddness , outlandishness, peculiarity, phenomenon, queerness, quirk, rarity, singularity, strangeness, unconventionality, unnaturalness

Definition:     eccentricity
Synonyms:     aberration, abnormality, anomaly, caprice, capriciousness, foible, freakishness, hereticism, idiocrasy, idiosyncrasy, irregularity, kink, nonconformity, oddity, oddness , outlandishness, peculiarity, queerness, quirk, singularity, strangeness, unconventionality, unorthodoxness, waywardness, weirdness, whimsicality, whimsicalness 

Etc.
Obviously, there are a lot of options for this blog.
Source: Dictionary.com