Emily Dickinson Lexicon

TE'DI-OUS, a. [Sp. and It. tedioso, from tedio, L. tædium; probably connected with W. ted, tedder, from the sense of drawing out.]

1. Wearisome; tiresome from continuance, prolixity, or slowness which causes prolixity. We say, a man is tedious in relating a story; a minister is tedious in his sermon. We say also, a discourse is tedious, when it wearies by its length or dullness.
2. Slow; as, a tedious course. Harte.