Neurasthenia is a term used to describe a psychological disorder that includes symptoms like fatigue, headaches, irritability, and anxiety. The opposite of being neurasthenic is to be energetic, lively, and resilient. Antonyms for the term "more neurasthenic" may include descriptions like optimistic, buoyant, exuberant, vibrant, and animated. These words depict a person who is full of vitality and energy, with a positive outlook on life. The antonyms for "more neurasthenic" showcase the opposite end of the spectrum, which is characterized by vigor and vivacity, as opposed to lethargy and fatigue.