spas·mod·ic 
(spăz-mŏdĭk)
(spăz-mŏdĭk)adj.
1. Relating to, affected by, or having the character of a spasm; convulsive.
2. Happening intermittently; fitful: spasmodic rifle fire.
3. Given to sudden outbursts of energy or feeling; excitable.
[New Latin spasmōdicus, from Greek spasmōdēs, from spasmos, spasm; see SPASM.]
spas·modi·cal·ly adv.