Pairs of Words with Contrasting Meanings (Antonyms):
General:
* Hot - Cold
* Light - Dark
* Big - Small
* Up - Down
* Fast - Slow
* Happy - Sad
* Good - Bad
* Right - Wrong
* Strong - Weak
* Old - Young
* Rich - Poor
* Easy - Difficult
* Open - Closed
* Clean - Dirty
* Wet - Dry
* Rough - Smooth
* Quiet - Loud
* Empty - Full
* True - False
* Alive - Dead
More Specific:
* Accept - Reject
* Agree - Disagree
* Appear - Disappear
* Arrive - Depart
* Awake - Asleep
* Brave - Cowardly
* Calm - Excited
* Careful - Careless
* Cheap - Expensive
* Cruel - Kind
* Dangerous - Safe
* Difficult - Easy
* Fail - Succeed
* Friendly - Unfriendly
* Generous - Stingy
* Honest - Dishonest
* Hopeful - Hopeless
* Humble - Proud
* Ignorant - Knowledgeable
* Important - Unimportant
* Innocent - Guilty
* Joyful - Sorrowful
* Just - Unjust
* Legal - Illegal
* Love - Hate
* Loyal - Disloyal
* Modern - Ancient
* Natural - Artificial
* Negative - Positive
* Normal - Abnormal
* Orderly - Chaotic
* Optimistic - Pessimistic
* Patient - Impatient
* Peaceful - Violent
* Perfect - Imperfect
* Pleasant - Unpleasant
* Possible - Impossible
* Present - Absent
* Private - Public
* Proud - Humble
* Real - Fake
* Regular - Irregular
* Reliable - Unreliable
* Rude - Polite
* Serious - Funny
* Simple - Complex
* Success - Failure
* Temporary - Permanent
* Traditional - Modern
* Ugly - Beautiful
* Useful - Useless
* Weak - Strong
* Wise - Foolish
* Worried - Calm
Note: Some words can have multiple contrasting meanings depending on the context.
Let me know if you'd like more specific or broader categories of antonyms!