I'm not a teacher.
There are a few synonyms and antonyms concerning the matter in question. You could try and find the proper word alone.
motivate (v) = 1. to stir to action or feeling 2. to impart courage, inspiration, and resolution to
synonyms: stimulate, instigate, arose, cause, drive, encourage, impel, incite, induce, inspire, kindle, move, stir, trigger, urge.
antonyms: discourage, depress, disconcert, dissuade, deter, prevent.