1. Mat-forming perennial found in cold springs of the eastern United States
   - American watercress, mountain watercress

Type of: watercress

• unexplorative
• unexploratory
• unexplored
• unexportable
• unexposed
• unexpressed
• unexpressible
• unexpressive
• unexpurgated
• unextended
• unfaceted
• unfading
• unfailing
• unfailingly
• unfair
• unfairly
• unfairness
• unfaithful
• unfaithfully
• unfaithfulness
• unfaltering
• unfalteringly
• unfamiliar
• unfamiliar with
• unfamiliarity