What's the opposite of big?
It's small
What's the opposite of boring?
It's interesting
What's the opposite of dangerous?
It's safe
What's the opposite of hot?
It's cold
What's the opposite of modern/new?
It's old
What's the opposite of quiet?
It's noisy
What's the opposite of ugly?
It's beautiful
What's the opposite of dirty?
It's clean
What's the opposite of empty?
It's crowded