The Collaborative International Dictionary
Insincerely
Insincerely \In`sin*cere"ly\, adv. Without sincerity.
Wiktionary
insincerely
adv. In an insincere manner.
WordNet
insincerely
adv. without sincerity; "she congratulated him somewhat insincerely" [ant: sincerely]
Usage examples of "insincerely".
But he who approaches Baptism insincerely, receives the sacrament without charity.
Fourthly, when it plays a part, and does or says anything insincerely and untruly.
Bill smarmed insincerely, with visions of weeks of no duty, months of lolling around, years of recuperation.