ineffective
//ˌɪnɪˈfɛktɪv//
Adjective
ineffectiveCanonical form
more ineffectiveComparative
most ineffectiveSuperlative
1
Not producing the desired effect or result; failing to achieve the intended purpose.
The medicine was ineffective against the virus.
2
Lacking the ability or skill to perform a task competently.
The ineffective manager failed to motivate his team.