Toughen First-Syllable Rhymes 16 Rhymes Found Add Toughen to Favorites Definition Thesaurus One-Syllable Rhymes 2 tough tuff Two-Syllable Rhymes 10 toughen toughened toughens tougher toughest toughie toughly toughness tufted tufting Three-Syllable Rhymes 4 tough-minded toughener tougheners toughening