1. Of or related to or exhibiting allotropism
   - allotropic

See also: allotropism

• unfeathered
• unfed
• unfeeling
• unfeelingly
• unfeelingness
• unfeigned
• unfeignedly
• unfeminine
• unfenced
• unfermented
• unfertile
• unfertilised
• unfertilized
• unfetter
• unfettered
• unfilial
• unfilled
• unfilmed
• unfinished
• unfinished business
• unfirm
• unfit
• unfitness
• unfitting
• unfix