late 15c., "disprove, prove to be untrue," a sense now obsolete; as the reverse of approve, "regard with moral condemnation, think wrong or reprehensible," it is attested from 1640s. See dis- + approve. Related: Disapproved; disapproving.
suffix forming nouns of action from verbs, mostly from Latin and French, meaning "act of ______ing" (such as survival, referral), Middle English -aille, from French feminine singular -aille, from Latin -alia, neuter plural of adjective suffix -alis, also used in English as a noun suffix. Nativized in English and used with Germanic verbs (as in bestowal, betrothal).