adj.
1.not divisible by two
2.not easily explained
3.an indefinite quantity more than that specified
4.beyond or deviating from the usual or expected
5.of the remaining member of a pair, of socks e.g.
6.not used up
Idiom of the Day
set (someone) back on his or her heels
to surprise/shock/overwhelm someone
The announcement by the principal set the teachers back on their heels.