what is an adverb that starts with "u" and has five letters?

Answer 1

Under

Main Entry: 1un·der
Pronunciation: '&n-d&r
Function: adverb
Etymology: Middle English, adverb & preposition, from Old English; akin to Old High German untar under, Latin inferus situated beneath, lower, infra below, Sanskrit adha
1 : in or into a position below or beneath something
2 : below or short of some quantity, level, or limit <$10 or under> -- often used in combination
3 : in or into a condition of subjection, subordination, or unconsciousness
4 : down to defeat, ruin, or death
5 : so as to be covered

Answer 2

ultra - meaning especially or very