Accumbent is an adjective that describes a person or animal lying down or reclining in a relaxed position. Some antonyms for the word accumbent include upright, standing, seated, active, energetic, and alert. These words describe a person or animal in a position that is opposite to the accumbent posture. For example, a person standing is the opposite of a person reclining in a relaxed position. Similarly, a person who is active and energetic is the opposite of a person who is lying down in a peaceful state. By understanding the antonyms of accumbent, we can communicate and describe a variety of postures and states of relaxation or activity.