1. most difficult or challenging
Usage: superlative form of hard
2. most solid, firm, or resistant to pressure
Usage: superlative form of hard
3. most severe or harsh
Usage: superlative form of hard

1. with the greatest effort or intensity
Usage: superlative form of hard

Examples

• This is the hardest math problem I’ve ever seen.
• Diamond is the hardest natural substance on Earth.
• She worked hardest during the final week of the project.
• The hardest part of moving is saying goodbye to friends.
• He hit the ball hardest in the final inning.
• Winter was the hardest season for the early settlers.
• She studied hardest for her chemistry exam.