Collocations for ineffective - adj.

be, prove, seem
These policies have proved ineffective.

become | make sth, render sth
The contract was rendered ineffective by this careless wording.

highly, singularly, very | completely, entirely, totally, wholly | largely | pretty, rather, relatively, somewhat | apparently | politically

against
These weapons are totally ineffective against tanks.

in
chemicals that are very ineffective in killing weeds