The term 'unprompted' can be defined by a variety of words, such as IMPULSIVE (9 letters), SPONTANEOUS (11 letters), INVOLUNTARY (11 letters), INSTINCTIVE (11 letters), UNASKED (7 letters), AUTOMATIC (9 letters), UNEXPECTED (10 letters), VIOLENT (7 letters), SUDDEN (6 letters), and SPEEDY (6 letters). These words all describe an action that is done without warning or prior thought. IMPULSIVE and AUTOMATIC refer to an action that is done without conscious thought, while SPONTANEOUS and INSTINCTIVE refer to an action that is done without any external prompting. UNASKED and UNEXPECTED refer to an action that is done without being asked or expected. VIOLENT, SUDDEN, and SPEEDY refer to an action that is done quickly and with force. All of these words can be used to describe an action that is done without any prompting or warning.