可疑
kě yí · HSK 7
suspicious
🕵️ 可 (can) + 疑 (doubt) = can-be-doubted = suspicious
可疑 stacks 可 'worthy of / can' onto 疑 'doubt, suspect'. Something 可疑 is literally worthy-of-doubt, i.e. suspicious or dubious.
可 — mouth 口 + breath marker 丁 (modified)
可 originally depicted a mouth (口) with a curved stroke suggesting exhaled breath or speech, conveying approval or assent. From this came the meaning 'to permit' or 'can,' as granting permission was expressed verbally. Today it broadly means 'may,' 'can,' or 'approve.'