lengthy adjective2 •Having length; long and overextended, especially in time rather than dimension.She died last night after a lengthy illness.They received lengthy prison terms. •Speaking or writing at length; long-winded.If, in addition to being a lengthy preacher, he had also been a Rev. Mr. Mumbles or a Rev. Dr. Drone, the penance thus endured by his people would have been intolerably severe. — 1863 formslengthier · lengthiest