Pertaining to, of the nature of, or characterized by spasm; affected by spasm or spasms; convulsive: as, spasmodic movements; spasmodic asthma; a spasmodic person.Attended by or manifesting procedure by fits and starts; jerky; overstrained; high-strung; rhapsodical: as, spasmodic action or efforts; spasmodic utterance or literature.n. Same as antispasmodic.