insincere
1. [ adjective ] lacking sincerity
Examples:

"a charming but thoroughly insincere woman" "their praise was extravagant and insincere"

Related terms: sincere bootlicking false buttery feigned gilded hypocritical dissembling false unreal dishonest disingenuous counterfeit sincerity
Similar spelling:   insincerely
  insincerity
  incinerate
  insinuate
  ingoing
  incinerator
  in_kind
  in_concert