Is Knackered a Bad Word?

As a phrase, knackered is not for polite use, but not offensive either. It's the sort of thing you'd say to a friend in a bar after a hard day, rather than to your boss. But it's pleasingly full of those hard consonants that the best swear words seem to rely on.

Is knackered a slang word?

adjective British Slang. exhausted; very tired: He is really knackered after work.

Is Prat a bad word?

According to Oxford Dictionaries, we started using “prat” to mean idiot in 1960, but before that, it was a 16th century word for buttocks. So when you call someone a prat, you're also calling them an arse.