resistant to cutting or chewing | consisting of or containing string or strings |
physically toughened | forming viscous or glutinous threads |
not given to gentleness or sentimentality | lean and sinewy |
unfortunate or hard to bear | (of meat) full of sinews; especially impossible to chew |
substantially made or constructed | |
feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad') | |
violent and lawless | |
very difficult; severely testing stamina or resolution | |
making great mental demands; hard to comprehend or solve or believe | |