This is the 4269th most frequent Japanese word.
偽っ
"偽っ" is the past tense or base form of "偽る," meaning "to deceive" or "to falsify."
Here, "偽っている" refers to the idea of something being false or fabricated, expressing doubt or potential deceit.
彼の話は偽っているかもしれない。
His story might be false.
In this sentence, "偽った態度" indicates a behavior or attitude that is not genuine, showing the act of pretending.
職場で偽った態度を取るのは疲れる。
Pretending to behave differently at work is exhausting.
"偽らない" in this context means not pretending or falsifying, describing a genuine person who expresses true feelings.