"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"
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