DECE'ASED, participle passive or adjective Departed from life. This is used as a passive participle. He is deceased for he has deceased; he was deceased for he had deceased This use of the participle of an intransitive verb is not infrequent, but the word omitted is really has. He has deceased It is properly an adjective, like dead.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI