1. Lacking proof or substantiation

See also: unproved, unproven

• tongue fern
• tongue twister
• tongue worm
• tongue-in-cheek
• tongue-lashing
• tongue-shaped
• tongue-tie
• tongue-tied
• tongued
• tonguefish
• tongueflower
• tongueless
• tongueless frog
• tonguelike
• tonguing and grooving plane
• Toni Morrison
• tonic
• tonic accent
• tonic epilepsy
• tonic key
• tonic solfa
• tonic water
• tonicity
• tonight
• tonite