unfrequented (adj.) unfree (adj.) unfounded (adj.) unfortune (n.) unfortunately (adv.) unfortunate (adj.) unformed (adj.) unforgotten (adj.) unforgiving (adj.) unforgiven (adj.) unforgivable (adj.) unforgettable (adj.) unforeseen (adj.) unforeseeable (adj.) unforced (adj.) unfold (v.) unflinching (adj.) unfledged (adj.) unflattering (adj.) unflappable (adj.)