Added 10 October 2026 toughened adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. More about toughened at Wordnik → Where our words come from → Physically toughened. the tough bottoms of his feet Made hard or flexible or resilient especially by heat treatment. a sword of tempered steel Related Words: annealedbakedburnedburntcallousedenuredhardenedinuredsunbakedtemperedthickenedtough Back to today's word