可耻
kě chǐ · HSK 7
shameful
可 (worthy of) + 耻 (shame) = worthy of shame = shameful
耻 carries the sense of disgrace; 可 marks something as deserving or -able. Together: deserving of disgrace, i.e. shameful or ignominious.
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.'