From Longman Dictionary of Contemporary Englishpassionlesspass‧ion‧less /ˈpæʃənləs/ adjective with no strong feelings of love a dull, passionless marriage
Examples from the Corpus
passionless• I tell you, hopeless grief is passionless.• Yet given the steamy circumstances, this whole shebang seems oddly passionless.• With so much at stake the first-half was a barren, passionless affair.• It was intended as a mark of possession - passionless, deliberate.• Would that passionless person mind if she got bad notices? 