unflagging (adj.) unfit (adj.) unfinished (adj.) unfetter (v.) unfelt (adj.) unfeigned (adj.) unfeeling (adj.) unfeasible (adj.) unfazed (adj.) unfavorable (adj.) unfathomed (adj.) unfathomable (adj.) unfasten (v.) unfashionable (adj.) unfamous (adj.) unfamiliar (adj.) unfaltering (adj.) unfaithful (adj.) unfairness (n.) unfair (adj.)