qiáng​hàn

tough

强悍 (強悍) qiáng​hàn
tough adjective
physically strong and mentally resolute; fierce or valiant in character

He has a very tough personality and never gives in to difficulties.

formidable adjective
powerful and intimidating; inspiring awe or fear through strength

The opponent is a very formidable team.

Frequency

Movie subtitles
4.62 per million appears in 2% of films
Written text
8.66 per million

Sources

Definitions
CC-CEDICT