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What is another word for tough?

What's another word for tough? | Here's a list of synonyms for tough.

Definition 1: an aggressive and violent young criminal - [noun denoting person]

Definition 1: a cruel and brutal fellow - [noun denoting person]

Definition 1: someone who learned to fight in the streets rather than being formally trained in the sport of boxing - [noun denoting person]

Definition 1: resistant to cutting or chewing - [adjective denoting all]

Definition 1: physically toughened - [adjective denoting all]

Definition 1: not given to gentleness or sentimentality - [adjective denoting all]

Definition 1: unfortunate or hard to bear - [adjective satellite denoting all]

Definition 1: substantially made or constructed - [adjective satellite denoting all]

Definition 1: feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad') - [adjective satellite denoting all]

Definition 1: violent and lawless - [adjective satellite denoting all]

Definition 1: very difficult; severely testing stamina or resolution - [adjective satellite denoting all]

Definition 1: making great mental demands; hard to comprehend or solve or believe - [adjective satellite denoting all]