Inadequate vs. Ineffective — What's the Difference?

Not adequate to fulfill a need or meet a requirement; insufficient.

Not producing an intended effect; ineffectual

Not adequate; not fit for the purpose

Inadequate; incompetent

An individual who is inadequate.

Not having the desired effect; ineffectual

Not adequate; unequal to the purpose; insufficient; deficient; as, inadequate resources, power, conceptions, representations, etc.

Lacking in ability; incompetent or inadequate

(sometimes followed by `to') not meeting the requirements especially of a task;

Not effective; not having the desired effect; ineffectual; futile; inefficient; useless; as, an ineffective appeal; an ineffective herbal remedy.

Not sufficient to meet a need;

Not producing an intended effect;

Lacking in power or forcefulness;

Lacking the ability or skill to perform effectively; inadequate;