Difference between Unkind and Cruel

UNKIND vs CRUEL: NOUN

Deficient in humane and kindly feelings
Lacking or showing kindness or compassion or mercy
Used of circumstances (especially weather) that cause suffering
Lacking kindness; inconsiderate or unsympathetic.
Harsh; severe.
Having no race or kindred; childless.
Not kind; contrary to nature, or the law of kind or kindred; unnatural.
Wanting in kindness, sympathy, benevolence, gratitude, or the like; cruel; harsh; unjust; ungrateful.
Lacking kindness

Lacking or showing kindness or compassion or mercy
(of weapons or instruments) causing suffering and pain
(of persons or their actions) able or disposed to inflict pain or suffering
Causing or characterized by severe pain, suffering, or distress.
Disposed to give pain to others; willing or pleased to hurt, torment, or afflict; destitute of sympathetic kindness and pity; savage; inhuman; hard-hearted; merciless.
Causing, or fitted to cause, pain, grief, or misery.
Attended with cruetly; painful; harsh.
Not nice; mean; heartless.
Cool; awesome; neat.
Used of circumstances (especially weather) that cause suffering

Not natural; unnatural.
Not sympathetic; lacking in or not springing from or exhibiting kindness, benevolence, or affection; not kind; harsh; cruel.

Synonyms Barbarous, savage, ferocious, brutal, merciless, unmerciful, pitiless, unfeeling, fell, ruthless, truculent, bloodthirsty, inexorable, unrelenting.
Proceeding from or exhibiting indifference to or pleasure in the suffering of others; causing pain, grief, or distress; performed or exerted in tormenting, vexing, or afflicting: as, a cruel act; a cruel disposition; the cruel treatment of animals.
Disposed to inflict suffering, physical or mental; indifferent to or taking pleasure in the pain or distress of any sentient being; willing or pleased to torment, vex, or afflict; destitute of pity, compassion, or kindness; hard-hearted; pitiless.
Very; extremely.

Rude, Edged, Cutting, Rigorous, Hard, Pitiless, Inhumane, Stinging, Brutal, Heartless, Unsympathetic, Harsh, Cruel, Unkindly, Hurtful

Inhuman, Callous, Barbaric, Fell, Roughshod, Rigorous, Hard, Barbarous, Unkind, Harsh, Vicious, Savage, Heartless, Brutal, Inhumane

Rude, Edged, Cutting, Rigorous, Hard, Pitiless, Inhumane, Stinging, Brutal, Heartless, Unsympathetic, Harsh, Cruel, Unkindly, Hurtful

Inhuman, Callous, Barbaric, Fell, Roughshod, Rigorous, Hard, Barbarous, Unkind, Harsh, Vicious, Savage, Heartless, Brutal, Inhumane

The Eighth Amendment prohibits cruel and unusual punishments, and torture would surely meet the standard of cruel and unusual.
The world is cruel, and the only morality in a cruel world is chance.
This extreme level of cruel treatment of a human being, however despicably such person might have treated another human being, is still inherently cruel.
Every cruel child is on the hunt for them; every cruel ride is engineered for their destruction.
Nothing in this section shall be construed to impose a duty to investigate observed or reasonably suspected animal abandonment, cruel neglect, or cruel mistreatment.
The only thing that makes me feel better is knowing ur in a better place and away from this cruel, cruel world!
It does not please my lord that anyone should mistreat me, you cruel, cruel people.
Cruel and Unusual Punishment, or Just Plain Cruel?
PERFECT run, but fate was a cruel, cruel mistress.
Oh, what a cruel, cruel woman Barbara Hambly was.