Definition of ineffectual adjective from the Oxford Advanced Learner's Dictionary

 

ineffectual

 adjective
adjective
BrE BrE//ˌɪnɪˈfektʃuəl//
 
; NAmE NAmE//ˌɪnɪˈfektʃuəl//
 
(formal)
 
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without the ability to achieve much; weak; not achieving what you want to an ineffectual teacher an ineffectual attempt to reform the law Word Origin late Middle English: from medieval Latin ineffectualis, from in- ‘not’ + effectualis, from Latin effectus (from efficere ‘accomplish’, from ex- ‘out, thoroughly’ + facere ‘do, make’); in later use from in- ‘not’ + effectual.Extra examples He plays the role of a blustering and ineffectual teacher. If only the head of department weren’t so ineffectual. My experience on the committees has shown me how slow and ineffectual they are. She made an ineffectual grab at the book. The president is seen as weak and ineffectual.
See the Oxford Advanced American Dictionary entry: ineffectual