厉害 = tremendous / awesome The Chinese use it a lot. It can also mean: you're damned good at this.

厉害 = Powerful noun:- serious damage adjective:- shrewd ferocious adverb:- intensely

the proper way to say good job !

generally, to describe something in an intensive extent

"厉害" can be a adjective, a noun or a adverb, We Chinese haven't a clear concept about part of speech. As for the meaning, surely various, check it in your dictionary!