1) Less couth 2) Less delicate 3) Less fine 4) Less refined 5) More unpolished 6) More vulgar 7) Not so fine 8) Not so refined 9) Of rougher texture 10) Rougher Found on https://www.crosswordclues.com/clue/coarser
of or pertaining to a topology on a topological space whose open sets are included among the open sets of a second specified topology on the space. Cf. finer. Found on https://www.infoplease.com/dictionary/coarser