Impetuous ARDOR' is a phrase used to describe an intense and passionate emotion. It is often used in literature to describe the feelings of love or desire. The word 'IMPETUOUS' means sudden and uncontrolled, while 'ARDOR' refers to strong emotion. Together, the phrase 'IMPETUOUS ARDOR' can be used to describe a person's overwhelming and uncontrollable emotion. The crossword solution ELAN is a synonym for this phrase, meaning enthusiasm or vigor.