- 1. a not given to gentleness or sentimentality s very difficult; severely testing stamina or resolution a physically toughened s substantially made or constructed s violent and lawless s feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad') a resistant to cutting or chewing s unfortunate or hard to bear s making great mental demands; hard to comprehend or solve or believe Source: ecdict
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toughest
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