endwise(adjective, adverb) adjective1. On-end; upright; pertaining or relating to the end. adverb1. on end or upright- sticks leaning against the wall endwaysSimilar word(s): endways2. in or toward the direction of the ends; lengthwise- endways pressureSimilar word(s): endways3. with the end forward or toward the observer- houses built endwaysSimilar word(s): endways