impermissible vs permissible

impermissible and permissible both are adjectives.

Word	Noun	Adjective	Verb	Adverb
impermissible	No	Yes	No	No
permissible	No	Yes	No	No

impermissible (adjective)	permissible (adjective)
not permitted	that may be permitted especially as according to rule
not allowable	that may be accepted or conceded