the opposite of improve
deteriorate
the opposite of generous
mean, stingy
the opposite of legal
illegal
the opposite of honest
dishonest
the opposite of sincere
insincere
the opposite of responsible
irresponsible
the opposite of allow
forbid, prohibit
the opposite of encourage
discourage, put off
the opposite of credible
incredible
the opposite of fake
genuine, authentic
the opposite of probable
improbable
the opposite of guilty
innocent
the opposite of appear
vanish, disappear