Added 9 October 2026 mightiness noun Categories: Describing WordsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about mightiness at Wordnik → Where our words come from → Physical strength. Related Words: mightpoweralmightinessalmightyshipmightymajestymagnificencetremendousnesstremendositybehemothomnipotencemajestie Back to today's word