It contained inhabitants of as undeleterious and self-satisfied a class of peasantry as ever clustered around a Maypole.
1640s, from Medieval Latin deleterius, from Greek deleterios "noxious," from deleter "destroyer," from deleisthai "to hurt, injure." Related: Deleteriously; deleteriousness.
deleterious del·e·te·ri·ous (děl'ĭ-tēr'ē-əs)
Having a harmful effect; injurious.