Spasmodic

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Merriam-Webster Online Dictionary
spasmodic (adjective)
1.
a) relating to or affected or characterized by - spasm
b) resembling a spasm especially in sudden violence - a spasmodic jerk
2.
acting or proceeding fitfully - intermittent spasmodic activity
3.
subject to outbursts of emotional excitement - excitable fitful
Merriam-Webster Online Thesaurus
spasmodic (adjective)
1.
lacking in steadiness or regularity of occurrence
SYNONYMS:
aperiodic, casual, catchy, choppy, discontinuous, episodic ( episodical), erratic, intermittent, irregular, occasional, spasmodic, spastic, sporadic, spotty, unsteady
RELATED WORDS:
convulsive, sudden, violent; broken, disconnected, fragmentary, interrupted; aimless, arbitrary, desultory, haphazard, hit-and-miss, hit-or-miss, odd, random, scattered, slapdash, stray; capricious, changeful, changing, flickery, fluctuating, fluid, inconstant, mercurial, mutable, temperamental, uncertain, unpredictable, unsettled, unstable, varying, wavering; changeable, fickle, variable, volatile
NEAR ANTONYMS:
changeless, equable, even, stable, stationary, uniform; unchanging, unvarying, unwavering; methodical ( methodic), orderly, systematic; unrelenting, unremitting
constant, continuous, habitual, periodic, regular, repeated, steady
spasmodic (adjective)
2.
easily excited by nature
SYNONYMS:
fiddle-footed, flighty, fluttery, high-strung, hyper, hyperactive, hyperexcitable, hyperkinetic, jittery, jumpy, nervous, skittery, skittish, spasmodic, spooky
RELATED WORDS:
hot-blooded, mercurial, temperamental, unstable, volatile, volcanic; anxious, edgy, flibbertigibbety, nervy, tense, uptight; emotional, emotionalistic, hypersensitive, intense, sensitive, soulful; dramatic, histrionic, melodramatic; irascible, irritable, perturbable, prickly, testy, touchy
NEAR ANTONYMS:
calm, collected, cool, serene, tranquil; easy, easygoing, laid-back, relaxed
imperturbable, nerveless, unexcitable, unflappable, unshakable
Spasmodic (Wikipedia)
Muscle spasm
Classification and external resources
Specialty Neurology
ICD-10 R25.2
ICD-9-CM 728.85
MeSH D013035

A spasm is a sudden involuntary contraction of a muscle, a group of muscles, or a hollow organ such as the heart.

A spasmodic muscle contraction may be caused by many medical conditions, including dystonia. Most commonly, it is a muscle cramp which is accompanied by a sudden burst of pain. A muscle cramp is usually harmless and ceases after a few minutes. It is typically caused by ion imbalance or muscle overload.

There are other causes of involuntary muscle contractions, and some of these may cause a health problem.