"a tough character"
"a rugged competitive examination" "the rugged conditions of frontier life" "the competition was tough" "it's a tough life" "it was a tough job"
"the tough bottoms of his feet"
"sturdy steel shelves" "sturdy canvas" "a tough all-weather fabric" "some plastics are as tough as metal"
"the more ruffianly element" "tough street gangs"
"my throat feels bad" "she felt bad all over" "he was feeling tough after a restless night"
"had hard luck" "a tough break"
"a baffling problem" "I faced the knotty problem of what to have for breakfast" "a problematic situation at home"