Antonyms of noun liar

1 sense of liar

Sense 1
liar, prevaricator -- (a person who has lied or who lies repeatedly)
       Antonym of square shooter (Sense 1)
      => square shooter, straight shooter, straight arrow -- (a frank and honest person)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun liar

1 sense of liar

Sense 1
liar, prevaricator -- (a person who has lied or who lies repeatedly)
       => deceiver, cheat, cheater, trickster, beguiler, slicker -- (someone who leads you to believe something that is not true)