tough adj.
1 difficult/unpleasant
VERBS be, seem | get
ADV. extremely, particularly, really, very | a bit, fairly, a little, pretty, quite Things were pretty tough at first.
PREP. on It's very tough on the wives when the husbands go off like that.
2 strict/firm
VERBS be | become, get
ADV. extremely, particularly, very | fairly, pretty, quite | enough Has the government been tough enough on polluters?
PREP. on The government has promised to get tough on crime. | with You have to be tough with these young thugs.
3 strong
VERBS be, feel, look, seem | become, get, grow | act, talk (both informal) Then this guy started acting tough.
ADV. incredibly, really, remarkably, very | pretty, quite, reasonably | enough Are you sure you're physically tough enough for this job? | mentally, physically
You can also check other dicts: tough (English, 中文解释 ), wordnet sense, Collins Definition