"Prudent" refers to acting with careful thought, wisdom, and consideration for the future. The opposite would be "stupid," which refers to acting recklessly, without careful thought or wisdom.

Opposite words: Careless, Imprudent, Heedless, Stupid.

"Supine" means lying flat on your back, looking upward. The opposite would be "vigilant," which refers to being alert, watchful, and attentive, often in a standing or active position.

Opposite Words: Able, Efficient, Vigorous, Recalcitrant, Despotic.

"Lethargic" describes a state of sluggishness, lack of energy, or inactivity. The opposite of this would be "energetic," which means full of energy and vitality.

Opposite words: Assiduous, Busy, Diligent, Kinetic, Lively, Perky, Vivacious, Vigorous. 

"Egress" refers to an exit or a way out. The opposite of this would be "entrance," which refers to a way in or the act of entering.

Opposite words: Access, Arrival, Entrance, Ingress.

"Protract" means to extend or lengthen something, especially time or a process. The opposite would be "truncate," which means to shorten or cut off.

Opposite words: Shortage, Reduce, Diminish, Abridge, Truncate.

"Morose" refers to being sullen, gloomy, or ill-tempered. The opposite would be "lighthearted," which means cheerful and carefree.

Opposite words: Amiable, Festive, Blithe, Buoyant, Jovial, Ebullient.

"Malign" means to speak harmful or evil about someone or something. The opposite of this would be "praise," which means to express approval or admiration.

Opposite words: Benevolent, Benign, Innocuous, Anodyne.

"Abjure" means to formally renounce or reject a belief or cause. The opposite would be "espouse," which means to adopt or support a belief or cause.

Opposite Words: Affirm, Assert, Contend, Declare, Espouse, Profess. 

"Peripheral" refers to something on the outer edge or margin. The opposite would be "central," referring to something located at the core or center.

Opposite words: Staple, Arch, Central, Interior, Intrinsic, Innermost.

"Trivial" refers to something of little value or importance. The opposite of this would be "significant," which means something important or meaningful.

Opposite words: Important, Significant, Material, Momentous, Crucial.