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insincerely
insincerity
insincere | American Dictionary
insincere
adjective
disapprovingus/ˌɪn·sɪnˈsɪər/
not feeling, believing, or meaning something although you pretend to; not sincere:
an insincere promise/offer
insincerity
noun[ U ]us/ˌɪn·sɪnˈser·ɪ·t̬i/
There’s often a bit of insincerity in these speeches.