Suspicious appearance or behavior; someone or something that seems shady or dubious.
举动和神色值得怀疑。
清·蒲松龄《聊斋志异·房文淑》邓以形迹可疑，故亦不敢告人，托之归宁而已。”
The man loitering near the bank was acting suspiciously, so the guard called the police.
Learn the next connected idiom: 形迹可疑 (xíng jì kě yí) → 疑难杂症 (yí nán zá zhèng)
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