| tough | (adjective) resistant to cutting or chewing | - |
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| (adjective) physically toughened | Synonyms: toughened |
| (adjective) not given to gentleness or sentimentality | - |
| (adjective) unfortunate or hard to bear | Synonyms: hard |
| (adjective) substantially made or constructed | Synonyms: sturdy |
| (adjective) feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad') | Synonyms: bad |
| (adjective) violent and lawless | Synonyms: ruffianly |
| (adjective) very difficult; severely testing stamina or resolution | Synonyms: rugged |
| (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: baffling, elusive, knotty, problematic, problematical |
| toughened | (adjective) physically toughened | Synonyms: tough |
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| (adjective) made hard or flexible or resilient especially by heat treatment | Synonyms: hardened, tempered, treated |