Answer: backbreaking

AnswerCrossword Clue
BACKBREAKINGReally difficult, as labor
BACKBREAKINGReally strenuous
BACKBREAKINGPhysically demanding
BACKBREAKINGStrenuous
BACKBREAKINGArduous
BACKBREAKINGPhysically difficult, as labor
BACKBREAKINGOnerous
backbreakingexhausting