Arrect means to make hair stand on end or erect, and some of its antonyms include smooth, flat, and straight. Smooth describes a surface that is even or uniform, without any bumps or ridges. Flat means level or horizontal, lacking any curves or angles. Straight describes something that is not bent or curved. Other antonyms for arrect include calm, relaxed, and flaccid, which describe the opposite of the tense and excited state associated with arrect. In general, words that describe a lack of movement, tension, or excitement are likely to have antonyms that contrast with arrect.