also: にせくんし
noun
Refers to a person who pretends to be virtuous or superior while hiding their true nature. Often used in a critical or moralistic context.
彼は偽君子だ。口では立派なことを言うが、行動が伴っていない。
He is a hypocrite. He says admirable things, but his actions don't match.
あの政治家
That politician is criticized as a hypocrite.
偽善者 also means 'hypocrite' but emphasizes feigning virtue or goodness, while 偽君子 can carry a nuance of pretending to be a gentleman or intellectual.
From Chinese 偽君子 (wěijūnzǐ), composed of 偽 (false) and 君子 (gentleman, person of virtue). The reading ぎくんし is the standard Sino-Japanese on'yomi; にせくんし mixes the native Japanese にせ (false) with くんし.