Definition from Wiktionary, the free dictionary
Alternative forms 
- ineffectuall (obsolete)
- unable or insufficient to produce effect; futile
- After several ineffectual and abortive leaps, we were forced to lift him over the obstacle.
- weak; lacking forcefulness
- Our group leader proved highly ineffectual, caving to every whim put forth by the other members.
- See also Wikisaurus:futile