To Lie
To Cheat, To Deceive
intransitive verb, transitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means fake and the verb vocab version is similar, it means to lie or to cheat or to deceive.
Someone tries to lie to you. You can't believe it. It's what (いつわ)??? You can't believe it.
日本では「言わぬが花」だと聞いたので、日本にいる間中自分は口がきけないと偽りました。
I heard "silence is a virtue" in Japan, so I pretended that I was incapable of speech while I was there.