A close antonym would be shrinkage.
enlarge
dearth, deficiency
plentiful
An antonym of the word learn is the word misunderstand.
Few. An antonym is a word that means the opposite.
Current or present is the closest antonym for the word former.
ineffective, ineffectual, unable, impuissant, Impotent
INSIGNIFICANT?
closed
conceited
Quiet
Clearness.
depressed
rejected.
allows
enlarge
tear apart