speedyadj (speedier, speediest)

• unfasten
• unfathomable
• unfavourable
• unfazed
• unfeeling
• unfetter
• unfettered
• unfinished
• unfit
• unfitting
• unfix
• unfixed
• unflagging
• unflappable
• unflattering
• unfledged
• unflinching
• unfocused
• unfold
• unforeseeable
• unforeseen
• unforgettable
• unforgivable
• unformed
• unfortunate