Turn it into a noun
to complain
complaint
belief
disbelief
an identity
identify
a disappointment
It's very....
disappointing
equal
equality
mature
immature
a conclusion
conclude
Science
It's very...
scientific
Inspire
inspiration
honest
dishonest
a prescription
prescribe
to believe
It's very...
believable
to be certain
certainty
mortal
immortal
A relief
relieve
To influence
He is very...
influential
to appear
appearence
obey
disobey
to be distinguished
distinguish
a resource
She is very...
resourceful