Crossword clues for the word: RETARDANT The word RETARDANT has appeared as an answer to at least 9 crossword clues on different crossword puzzles. Crossword clues for RETARDANT Showing 1 to 9 of 9 results Clue(s) Any agent that delays or hinders Certain chemical substance Delaying Delaying agent Growth inhibitor Inhibitor Insect that infests crossing bitumen? It slows things down Suppressor Tending to delay