Crosswordiee.com

% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Dull: slow. 5 letters:

INERT: Dull: slow.
UNAPT: Slow; dull
TORPID: Slow and dull
POKY: Dull; annoyingly slow