HSK 7-9
理直气壮
lǐzhí-qìzhuàngin the right and self-confident (idiom); bold and confident with justice on one's side; to have the courage of one's convictions; just and forceful
证据充分，她说得理直气壮。
Zhèngjù chōngfèn, tā shuō de lǐzhí-qìzhuàng.
With ample evidence, she spoke with complete confidence.
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Appears across levels (7-9) in the HSK 3.0 word list.