Circumducts means to rotate or move in a circular motion. The antonyms for this word would involve movements that are not circular. Some possible antonyms for circumducts can be to go straight, move in a linear direction, move in a straight line, or move in a forward-backward motion. Other antonyms may include change, invert, overturn, transform, or reverse. These words describe actions that are the opposite of circumducts and imply that the movement is not circular, but rather either straight or different in nature. So, depending on the context, the antonyms for circumducts can be many and varied.