INCALCULABLE

1. very numerous or great.
2. unable to be calculated; beyond calculation.
3. incapable of being forecast or predicted; undeterminable.
4. uncertain; unsure.

I had to delete my first post...I realized it was a verb not an adj. lol

INCONGRUOUS

mismatched
out of place
absurd
discordant
incompatible
unexpected

IRIDESCENT

lustrous
colorful
glittering

IMPUDENT

Sassy
Rude
Presumptuous