- (superl.) Severe; violent; as, a tough storm.
- (superl.) Not easily broken; able to endure hardship; firm; strong; as, tough sinews.
- (superl.) 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.
- (superl.) Not easily separated; viscous; clammy; tenacious; as, tough phlegm.
- (superl.) Stiff; rigid; not flexible; stubborn; as, a tough bow.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). tough. Retrieved September 25, 2026, from http://smartdefine.org/tough/definitions/2073558 |
| Chicago | Webster's. 2011. "tough" http://smartdefine.org/tough/definitions/2073558 (accessed September 25, 2026). |
| Harvard | Webster's 2011, tough, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/tough/definitions/2073558>. |
| MLA | Webster's. "tough" 28 May 2011. Web. 25 September 2026. <http://smartdefine.org/tough/definitions/2073558> |