Difference between Inability and Unfitness

INABILITY vs UNFITNESS: NOUN

Lack of the ability to do something; incapability
The quality or state of being unable; lack of ability; lack of sufficient power, strength, resources, or capacity.
Specifically In theology, want of power to obey the law of God.
The state of being unable, physically, mentally, or morally; want of ability; lack of power, capacity, or means: as, inability to perform a task, or to pay one's debts.
Lack of ability or means.
Lack of ability (especially mental ability) to do something
Lacking the power to perform

Absence, Incapacity, Unavailability, Ineptitude, Inadequacy, Ineffectiveness, Lack, Failed, Incapability, Refusal, Failing, Ability, Failure, Unwillingness, Unfitness

Incompetence, Incompetency, Disablement, Disability, Failure, Invalidity, Incapacitation, Ineptitude, Inadequacy, Incapability, Incapacity, Unsuitability, Poor shape, Bad condition, Inability

Powerlessness, Inefficiency, Shortcoming, Incompetence, Absence, Unavailability, Ineptitude, Inadequacy, Lack, Failed, Refusal, Failing, Ability, Failure, Unwillingness

Misfeasance, Infirmity, Frivolousness, Untimeliness, Dishonesty, Untrustworthiness, Incompetence, Incompetency, Disablement, Disability, Failure, Invalidity, Ineptitude, Inadequacy, Inability

Inability to have an erection suitable for intercourse.
Stuttering, inability to articulate consonants and vowel sounds.
Bosses and towers are immune to inability effects.
However, I feel this inability is only temporary.
Unrealistic expectation or the inability to implent policy?
Dory with an inability to develop declarative memory.
Inability to see the funny side of things.
Inability to carry out any activity without discomfort.
They cover everything from our inability to travel to our inability to seek psychological assistance, for example.
Accordingly, the attachment system is more undermined by inability to depend on and fit in with others than on inability to gain autonomy.

Congress to remove Trump from office on the grounds of mental unfitness.
We had therefore to choose between war and the charge of unfitness.
Here, there is no compelling reason to reach the unfitness claim.
Physician Health Services, that underlying causes of unfitness cannot be remediated.
Inadequate performance of duty, by itself, does not constitute physical unfitness.
Article commentary: prenatal substance use: exploring assumptions of maternal unfitness.
Serious infections like hepatitis, HIV are causes for permanent unfitness.
Regular warrant officers: elimination for unfitness or unsatisfactory performance.
Such conduct demonstrates an unfitness to practice law.
ANT: Unfitness, unsuitableness, insusceptibility, slowness, stupidity, unreadiness, awkwardness.