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Ineffective (Adjective)

Lacking in power or forcefulness; "an ineffectual ruler"; "like an unable phoenix in hot ashes".

All adjective clusters.

Not producing an intended effect; "an ineffective teacher"; "ineffective legislation".

All adjective clusters.

The antibiotic was ineffective against the new strain of bacteria.
Her ineffective leadership resulted in the team's poor performance.
The ineffective air filter failed to reduce the allergens in the room.
Despite the new policy, the ineffective enforcement measures meant that little changed.
After several ineffective attempts, the fire department decided to change their tactics.

Lacking the ability or skill to perform effectively; inadequate; "an ineffective administration"; "inefficient workers".

All adjective clusters.

The medication was ineffective against the new strain of the virus, leaving doctors scrambling for an alternative treatment.
The company's ineffective marketing strategy led to a significant decline in sales.
The teacher's ineffective classroom management techniques made it difficult for her students to learn.
The ineffective air conditioning system in the building made it unbearable to work on hot summer days.
The audit revealed an ineffective accounting system that was prone to errors and discrepancies.