Answer: toughest

AnswerCrossword Clue
TOUGHESTMost challenging
toughest(of a person) Strong and prone to violence
toughest(of food, esp. meat) Difficult to cut or chew
toughestTOUGH, strong and resilient
toughestUsed to express sympathy with someone in an unpleasant or difficult situation
toughest(of a person or animal) Able to endure hardship or pain; physically robust
toughestUsed to express a lack of sympathy with someone
toughestInvolving considerable difficulty or hardship; requiring great determination or effort
toughestAble to protect one's own interests or maintain one's own opinions without being intimidated by opposition; confident and determined
toughest(of an area) Notorious for violence and crime
toughest(of a substance or object) Strong enough to withstand adverse conditions or rough or careless handling
toughestDemonstrating a strict and uncompromising attitude or approach