The term 'NOT SO FAST!' is a phrase used to indicate that someone should SLOW down or take their time. The crossword solutions for this term include SLOWER (6 letters), WHOA (4 letters), WAIT (4 letters), EASY (4 letters), ANDANTE (7 letters), SLOW (4 letters), STOP (4 letters), ADAGIO (6 letters), HANGON (6 letters), HOLDIT (6 letters), HOLDON (6 letters), SUPPER (6 letters), GRADUAL (7 letters), SEEHERE (7 letters), SUBSONIC (8 letters), WAITASEC (8 letters), DONTRUSHME (10 letters), EASYDOESIT (10 letters), SETTLEDOWN (10 letters), TAKEITSLOW (10 letters), WHOANELLIE (10 letters), and YUBTETIKWC (10 letters). These words all suggest that someone should SLOW down or take their time, which is the main idea behind the phrase 'NOT SO FAST!'.