tough

degrees tougher - toughest

adjective: strong enough to withstand adverse conditions or rough handling; durable
- The hiking boots were made of tough leather to survive the rocky terrain.
adjective: able to endure hardship or pain; resilient
- She's a tough person who never gives up, no matter the challenge.
adjective: difficult and requiring determination or effort
- The final exam was really tough, with many complex problems.
adjective: strict and uncompromising
- The coach has a tough policy on being late to practice.
adjective: involving violence or aggression; characterized by a rough or violent nature
- He grew up in a tough neighborhood.
adjective: of food, difficult to cut or chew
- The steak was so tough I could barely eat it.