aversive

/AH0 V ER1 S AH0 V/
noun
  1. 1

    (grammar) a grammatical case indicating that something is avoided or feared; the evitative case

  2. 2

    An unpleasant stimulus intended to induce a change in behaviour

adjective
  1. 1

    Tending to repel, causing avoidance (of a situation, a behaviour, an item, etc.)

Source: https://en.wiktionary.org/wiki/aversive