1. not producing an intended effect
- an ineffective teacher
- ineffective legislation
2. producing no result or effect
- the therapy was ineffectual
3. lacking in power or forcefulness
- an ineffectual ruler
Sentences with ineffectual as an adjective:
- After several ineffectual and abortive leaps, we were forced to lift him over the obstacle.
- Our group leader proved highly ineffectual, caving to every whim put forth by the other members.