Spur-of-the moment Spur-of-the moment antonyms planned prepared read rehearsed written calm cautious circumspect considerate reflective sensible Full list of antonyms (22) Spur-of-the moment synonyms improvised makeshift offhand off-the-cuff ad-hoc cheaply done cheaply made crude but effective jury-rigged of inferior quality quick-and-dirty Full list of synonyms (103)
