Difference between Inadequate and Unable

INADEQUATE vs UNABLE: ADJECTIVE

(usually followed by `to') not having the necessary means or skill or know-how
Lacking the necessary power, authority, or means; not able; incapable.
Lacking mental or physical capability or efficiency; incompetent.
Not susceptible to action or treatment.
Not able; not having sufficient strength, means, knowledge, skill, or the like; impotent; weak; helpless; incapable; -- now usually followed by an infinitive or an adverbial phrase.
Not able; lacking a certain ability.
(usually followed by `to') lacking necessary physical or mental ability
Lacking in power or forcefulness

Not adequate; not equal to requirement; insufficient to effect the end desired; incomplete; disproportionate; defective.
Synonyms Incommensurate, incompetent.
Of insufficient quantity to meet a need

Inadequacy, Adequate, Unequal to, Short handed, Short staffed, Wanting, Short, Undermanned, Incapable, Incompetent, Poor, Lacking, Understaffed, Deficient, Insufficient

Helpless, Incapacitated, Unfit, Unsuccessful, Not, Insufficient, Powerless, Impossible, Failed, Able, Not able, Ineffectual, Incapable, Ineffective, Impotent

Inadequacy, Adequate, Unequal to, Short staffed, Short handed, Wanting, Short, Undermanned, Incapable, Incompetent, Poor, Lacking, Understaffed, Deficient, Insufficient

Helpless, Incapacitated, Unfit, Unsuccessful, Not, Insufficient, Powerless, Impossible, Failed, Able, Not able, Ineffectual, Incapable, Ineffective, Impotent

Performance is inadequate, indicates lack of skill, unsafe nursing practice, inadequate depth of knowledge, or application of nursing principles.
Safety audits have shown that many of our cities have inadequate vending spaces, lack of public facilities and inadequate transport.
Substandard assets are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity, or marginal capitalization.
Fundamentally, inadequate coverage results in inadequate access and treatment, and Canadians recognize the need to address this.
The audits also showed that inmates had inadequate food, medical care, and in some cases inadequate housing.
We have entered a realm in which conventional wisdom, always inadequate, is dangerously inadequate.
Degradation Analysis is inadequate and results in inadequate consideration of reasonable protection measures.
Inadequate questioning of prospective buyers Inadequate tools and procedures to validate individual?
Inadequate QA staffing can also resultin inadequate quality auditing of the QC.
Poor product delivery, inadequate systems, and inadequate charge.