The antonym for "none" is "some". I guess. You can't really say none has an antonym.
Some.
All
no one
somebody
some
One opposite is "forgettable."
One opposite of "grasp" can be "relax". One opposite of "unwind" can be "ravel".
The opposite of dark is "light."
The opposite of all is none. (or no one, if persons)
the plural of opposite is opposites.
The opposite of no one is everyone.
the answer is steady
The opposite of one half is negative one half.
One opposite is "untried".
One opposite is "forgettable."
Exposure is one opposite.
One opposite of "grasp" can be "relax". One opposite of "unwind" can be "ravel".
The opposite of micro is "macro." (large size) The opposite prefix of micro- (one millionth) is mega- (one million).
An additive opposite, yes. A multiplicative one, no.
The opposite of dark is "light."
Valleys would be one opposite for cliffs.
The opposite of all is none. (or no one, if persons)