Difference between Inability and Unwillingness

INABILITY vs UNWILLINGNESS: 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

Aversion, Determination, Hesitancy, Lack, Refuse, Disinterest, Intransigence, Failure, Desire, Reticence, Refusing, Inability, Willingness, Refusal, Reluctance

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

Slackness, Denial, Rejection, Hesitancy, Lack, Refuse, Disinterest, Intransigence, Failure, Desire, Reticence, Refusing, Inability, Refusal, Reluctance

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.

There is a lot of unwillingness to tackle corruption.
Clinton reflect an unwillingness to compromise and unyielding nature.
Koizumi has expressed his unwillingness to do so.
Unwillingness or inability to comply with study requirements.
SMEs, unwillingness to cede control of their businesses.
The short answer: fear and unwillingness to change.
Could this indicate an unwillingness to take risks?
Difficulty did not result in unwillingness to answer.
Unwillingness to Delay Gratification: Unwillingness to endure discomfort or difficulty to obtain desired results.
But her inability was at least partially unwillingness, unwillingness to think negatively about anyone she knows.