Added 9 October 2026 hardened /ˈhɑːdn̩d/ adjective Categories: Describing WordsUncommon Words adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about hardened at Wordnik → Where our words come from → Used of persons; emotionally hardened. faced a case-hardened judge Made hard or flexible or resilient especially by heat treatment. a sword of tempered steel Protected against attack (especially by nuclear weapons). hardened missile silos Related Words: hardtoughcase-hardenedtemperedsetburntsunbakedtreatedbakedhard-boiledannealedburned Back to today's word