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Adjective: insincere  ,in-sin'seer
  1. Lacking sincerity
    "a charming but thoroughly insincere woman"; "their praise was extravagant and insincere"

See also: artful, bootlicking, buttery, counterfeit, dishonest, dishonorable [US], dishonourable [Brit, Cdn], disingenuous, dissimulative, false, fawning, feigned, fulsome, gilded, glossy, hypocritical, imitative, meretricious, obsequious, oily, oleaginous, plausible, sincerity, smarmy, soapy, specious, sycophantic, toadyish, unctuous, unreal

Antonym: sincere

Encyclopedia: Insincere