admissible

/AH0 D M IH1 S AH0 B AH0 L/
adjective
  1. 1

    Capable or deserving to be admitted, accepted or allowed; allowable, permissible, acceptable.

  2. 2

    Describing a heuristic that never overestimates the cost of reaching a goal.

Antonyms

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