IPA: /ˈbleɪmˌwɜːrθɪnəs/
KK: /ˈbleɪmˌwɜrθiˌnəs/
The quality of being deserving of blame or criticism for a fault or wrongdoing.
The judge considered the blameworthiness of the defendant before making a decision.
Blameworthiness is formed from "blame" (from Old English "blæman", meaning to accuse or censure) and "-worthiness" (from Old English "wyrðe", meaning worthy or deserving). The word refers to the quality of being deserving of blame or censure.
Think of the act of 'accusing' ('blame') someone and the idea of being 'worthy' of that accusation — that's what blameworthiness means.