Home Dee Dee Word of the Day – Aug. 3 – Mettlesome Dee Dee Word of the Day – Aug. 3 – Mettlesome By Staff mB - August 3, 2012 1026 Adjective: Mettlesome (MET-ul-sum) Definition: Full of vigor and stamina: spirited Sample sentence: The mettlesome bronco kicked and bucked, but the rider kept her balance and rode her out.