Thorough may refer to: Thorough (policy) of Laud and Wentworth in England and Ireland in the 1630s Thorough Guides, late-Victorian travel guides HMS Thorough (P324), British submarine 1942–62 Thorough-bass, a kind of musical notation in which numerals and symbols indicate intervals, chords, and non-chord tones, in relation to the bass note they are placed above or below. Efficiency–thoroughness trade-off principle
See also Thoroughbred (disambiguation) Thoroughfare (disambiguation) Thoroughwort, genus Eupatorium of flowering plants in the aster family Thoroughly Modern Millie, 1967 musical