Webster's Revised Unabridged Dictionary · 1913

Tough

Tough , adjective

[Old English tough, Anglo-Saxon tōh, akin to Dutch taai, LG. taa, tage, tau, Old High German zāhi, German zahe, and also to Anglo-Saxon getenge near to, close to, oppressive, Old Saxon bitengi.]

1.
Having the quality of flexibility without brittleness; yielding to force without breaking; capable of resisting great strain; as, the ligaments of animals are remarkably tough.
Tough roots and stubs. — Milton
2.
Not easily broken; able to endure hardship; firm; strong; -- of objects and people; as, tough sinews. — Cowper
A body made of brass, the crone demands,... Tough to the last, and with no toil to tire. — Dryden
The basis of his character was caution combined with tough tenacity of purpose. — J. A. Symonds
3.
Not easily separated; viscous; clammy; tenacious; as, tough phlegm.
4.
Stiff; rigid; not flexible; stubborn; as, a tough bow.
So tough a frame she could not bend. — Dryden
5.
Severe; violent; as, a tough storm. [Colloquial]
A tough debate. — Fuller
6.
Difficult to do, perform, or accomplish; as, a tough job.
7.
Prone to aggressive or violent behavior; rowdyish; -- of people, or groups; as, a tough neighborhood; a tough character.
Collocations (1)
To make it tough , to make it a matter of difficulty; to make it a hard matter. [Obsolete] — Chaucer

tough , noun

A person who is tough{7}; a ruffian; a thug; as, a cluster of neighborhood toughs hanging out on the corner.