ineffectual

adjective3

1. •
   Unable or insufficient to produce effect.

   • Until the recent rash of North London line maps appeared on station billboards in the London area of BR, the service undoubtedly suffered from meagre and ineffectual publicity. — 1964
2. •
   Worthless; ineffective.
3. •
   Weak, indecisive; lacking forcefulness.

   • Our group leader proved highly ineffectual, caving to every whim put forth by the other members.