asthenic s lacking strength or vigor s having a slender physique Usage(s) Moscow's media corps scrambled for its medical dictionaries Tuesday, in search of the meaning of "asthenic. Whimsy is asthenic fantasy, a fragile, elusive quality difficult to render but easy to shatter into sentimentality. An asthenic-looking fop, playing an innocent love scene with Charlotte Corday, promptly tries to rape her. Synonym(s) adynamic debilitated enervated