1. Dead, deceased, extinct, lifeless refer to something that does not have or appear to have life. Dead is usually applied to something that had life but from which life is now gone: dead trees. Deceased, a more formal word than dead, is applied to human beings who no longer have life: a deceased member of the church. Extinct is applied to a species, genus, or the like, no member of which is any longer alive: Mastodons are now extinct. Lifeless can be applied to a living thing that no longer appears to be alive ( the lifeless body of an unidentified man ) or to something that may never have been a living thing ( the lifeless materials of these minerals ).

half-dead

adjective