undoing an act that makes a previous act of no effect
undue not appropriate or proper in the circumstances
unearth recover through digging
uneasy causing or fraught with or showing anxiety
unencumbered free of anything that impedes or is burdensome
unequivocal admitting of no doubt or misunderstanding
unerring not liable to error
unexceptionable completely acceptable; not open to reproach
unfaltering marked by firm determination or resolution; not shakable
unfathomable impossible to come to understand

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