TOUGH is validvalid

strong and resilient [adj TOUGHER, TOUGHEST] : TOUGHLY [adv], TOUGHNESS [n] / to endure hardship [v TOUGHED, TOUGHING, TOUGHS]

13,884 of 196,601 in NWL2023·also valid in CSW24

hard, durable [adj TOUGHER, TOUGHEST, TOUGHLY] / to endure [v -ED, -ING, -S]