Big.
big, huge, gigantic,
The opposite of small is large, or sizable. (also big, opposite of little)
A few , A little A dearth.
a little
No
The opposite of 'big' is little.
The opposite of much is usually little or not much.(where it means many, or numerous, the opposite can be few).
The opposite of mucho (a lot) would be un poco (a little).
"Little"
MinorMinor, lesser, little, small...
The opposite of 'much' is 'little'.
little chiken
The opposite of small is large, or sizable. (also big, opposite of little)