Superlative form of tough; most difficult to endure, cut, or break.
From Middle English tough, from Old English tōh meaning 'tenacious, sticky'. Related to German zäh meaning 'tough, tenacious'. The superlative form developed naturally in English, with the meaning evolving from physical hardness to difficulty or resilience.
What's fascinating about 'toughest' is how it bridges physical and metaphorical strength - the toughest material and the toughest person both resist breaking under pressure. The word's evolution from describing sticky substances to describing resilient people shows how we understand character through physical metaphors.
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