Answer: inuring

AnswerCrossword Clue
INURINGHabituating (to)
INURINGAccustoming (to)
INURINGHaving effect
INURINGHabituating.
INURINGTaking effect
INURINGToughening
inuringINURE, to accustom oneself to accept unpleasant things
inuringto toughen or accustom