spasmodic vs unflappable

spasmodic

noun
  • A medicine for suppressing spasms. 

adj
  • Convulsive; consisting of spasms. 

  • Intermittent or fitful; occurring in abrupt bursts. 

  • Of or relating to a spasm; resembling a sudden contraction of the muscles. 

  • Erratic or unsustained. 

  • Of or relating to the spasmodic poets, a group of British Victorian poets who wrote introspective drama in verse. 

unflappable

adj
  • Remaining composed and level-headed at all times; impossible to fluster; not becoming frustrated or irritated easily. 

How often have the words spasmodic and unflappable occurred in a corpus of books? (source: Google Ngram Viewer )