Antonyms of adj two-lipped

1 sense of two-lipped

Sense 1
bilabiate, two-lipped -- (having two lips; "the corolla of a snapdragon is bilabiate")

INDIRECT (VIA lipped) -> lipless, unlipped -- (without a lip or lips)

Similarity of adj two-lipped

1 sense of two-lipped

Sense 1
bilabiate, two-lipped -- (having two lips; "the corolla of a snapdragon is bilabiate")
       => lipped (vs. lipless) -- (having a lip or lips; "a lipped bowl"; "a virgin purest lipped"- John Keats)