FreeVocabulary
Impeccable
/ɪmˈpɛk.ə.bəl/ adjective easyFlawless, in accordance with the highest standards, without any fault.
The waiter's impeccable manners made even the pickiest guests feel welcome.
Memory Trick
Impeccable: im- (not) plus a root meaning 'able to sin' — literally incapable of doing wrong.