HSK 7-9
当真
dàngzhēn动副
to take seriously; serious; No joking, really!
大家随口一说他却当真了。
Dà jiā suí kǒu yì shuō tā què dàng zhēn le.
Everyone said it casually, but he took it seriously.
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Appears across levels (7-9) in the HSK 3.0 word list.