Un-

Front

uncommon

Back

rare, not the usual, remarkable

Front

unworthy

Back

not deserving; not having any value

Front

untidy

Back

messy; not neat; not organized

Front

unmistakable

Back

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

Front

uncertain

Back

not sure

Front

unusual

Back

not common; different from what is expected

Front

unfair

Back

not just or equal; not treating everyone the same

Front

unpleasant

Back

not enjoyable; causing discomfort or displeasure

Front

unbelievable

Back

not able to be believed; extraordinary or hard to accept as true

Front

unfriendly

Back

not friendly; not kind or welcoming