Tough (adjective)

1. Able to withstand great strain or hardship.
2. Difficult or challenging to deal with.
3. Strong and durable.
4. Having or showing a determined and unyielding character.

Origin:

Late 16th century: from french touffe "tuft", from old french toufe, of germanic origin.

Examples:

1. A tough life on the farm.
2. A tough decision to make.
3. A tough material that's hard to break.
4. A tough guy who doesn't cry.
5. A tough competition that tests one's strength.