Un-

Front

untidy

Back

messy; not neat; not organized

Front

undecided

Back

not yet at the point of making a decision

Front

unmistakable

Back

clear; cannot be understood the wrong way; not able to be confused or misunderstood

Front

uncommon

Back

rare; not the usual; remarkable

Front

unexpected

Back

not what someone thought would happen; not predicted

Front

unwise

Back

not showing good judgment; foolish

Front

uncertain

Back

not sure; having doubt or hesitation

Front

unworthy

Back

not deserving; not having value or merit

Front

unusual

Back

not common; different from what is normal

Front

unfriendly

Back

not kind; not friendly or welcoming