This is the 13649th most frequent Swedish word.
verkningslösa
Ineffective.
Here 'verkningslösa' is used as an adjective to describe the medications, implying they lack the intended effectiveness.
Medicinerna visade sig vara verkningslösa.
The medications turned out to be ineffective.
In this sentence, 'verkningslösa' describes chemical formulas that failed to produce intended reactions or effects.
The chemical formulas they used were verkningslösa.
De kemiska formlerna de använde var verkningslösa.
Here 'verkningslösa' is describing the suggestions as ineffective in achieving their intended results.