Adjective has 1 sense

• ho-hum(s = adj.all) boring, deadening, dull, irksome, slow, tedious, tiresome, wearisome - so lacking in interest as to cause mental weariness; "a boring evening with uninteresting people"; "a dull play"; "a ho-hum speaker who couldn't capture their attention"; "his competent but dull performance"; "other people's dreams are dreadfully wearisome"; "tedious days on the train"; "the deadening effect of some routine tasks"; "the tiresome chirping of a cricket"; "what an irksome task the writing of long letters is"