As adjectives the difference between improportionate and disproportionate
is that improportionate is not proportionate while disproportionate is not proportionate.
As a verb disproportionate is
to undergo disproportionation.
disproportionate
English
Adjective
(
en adjective)
Not proportionate.
Out of proportion.
Verb
(disproportionat)
(chemistry) To undergo disproportionation