The opposite of easy is
Difficult
The opposite of busy is
Quiet
The opposite of quiet
Busy
The opposite of exciting is
Boring
The opposite of busy
Quiet
The opposite of loud is
Quiet
What's the opposite of new?
Old
The opposite of exciting
Boring
The opposite of clean is
Dirty
The opposite of dirty is
Clean
The opposite of young is
Old
The opposite of difficult is
Easy
The opposite of interesting is
Boring
The opposite of old is
New
The opposite of bad is
Good
The opposite of good is
Bad
The opposite of quiet
Loud