/ ˈspæstɪk; NAmE / adjective
1.
( medical or old-fashioned ) having or caused by cerebral palsy , an illness which makes it difficult for sb to control their muscles and movements. Using this word is now often considered offensive :
spastic children
spastic reactions
2.
( informal ) an offensive word, sometimes used by children to mean 'stupid'
► spas·tic noun
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WORD ORIGIN
mid 18th cent.: via Latin from Greek spastikos pulling, from span pull.