unctuously

Adverb

Insincerely and excessively charming

Japanese Meaning

不誠実で、過度に愛想よく振る舞う様子 / うわべだけで、過剰なお世辞を述べる態度

He smiled unctuously as he praised the mayor's plan, but everyone could tell he didn't mean it.

彼は市長の計画を褒めながらお世辞たっぷりに笑ったが、誰もが彼が本心ではないと分かっていた。

Sense（1）

Insincerely and excessively charming

more unctuously

（ comparative ）

most unctuously

（ superlative ）