Antonyms of verb untwist

1 sense of untwist

Sense 1
untwist -- (cause to become untwisted)
       Antonym of twist (Sense 4)
      => twist, twine, distort -- (form into a spiral shape; "The cord is all twisted")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb untwist

1 sense of untwist

Sense 1
untwist -- (cause to become untwisted)
       => straighten, straighten out -- (make straight)

Antonyms of adj untwisted

1 sense of untwisted

Sense 1
untwisted -- (not twisted; formerly twisted but now straight)

INDIRECT (VIA straight) -> crooked -- (having or marked by bends or angles; not straight or aligned; "crooked country roads"; "crooked teeth")

Similarity of adj untwisted

1 sense of untwisted

Sense 1
untwisted -- (not twisted; formerly twisted but now straight)
       => straight (vs. crooked) -- (having no deviations; "straight lines"; "straight roads across the desert"; "straight teeth"; "straight shoulders")