heartless

Unsympathetic is a related term of heartless.

As adjectives the difference between unsympathetic and heartless

is that unsympathetic is not sympathetic while heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring.

Heartless is a related term of inexorable.

As adjectives the difference between heartless and inexorable

is that heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring while inexorable is unable to be persuaded; relentless; unrelenting.

Heartless is a related term of reserved.

As adjectives the difference between heartless and reserved

is that heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring while reserved is (comparable) slow to reveal emotion or opinions.

As a verb reserved is

(reserve).

Heartless is a related term of contemptuous.

As adjectives the difference between heartless and contemptuous

is that heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring while contemptuous is showing contempt; expressing disdain; showing a lack of respect.

As adjectives the difference between heartless and brutal

is that heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring while brutal is (savagely violent)Savagely violent, vicious, ruthless, or cruel.

Heartless is a related term of unexcitable.

As adjectives the difference between heartless and unexcitable

is that heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring while unexcitable is not excitable.

Heartless is a related term of unpitying.

As adjectives the difference between heartless and unpitying

is that heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring while unpitying is not feeling or showing pity.

Hardened is a related term of heartless.

As adjectives the difference between hardened and heartless

is that hardened is unfeeling or lacking emotion due to experience; callous while heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring.

As a verb hardened

is (harden).

Unkind is a related term of heartless.

As adjectives the difference between unkind and heartless

is that unkind is (obsolete) having no race or kindred; childless while heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring.

As adjectives the difference between heartless and determined

is that heartless is without a heart; specifically, without feeling, emotion, or concern for others; uncaring while determined is decided; resolute, possessing much determination.

As a verb determined is

past tense of determine.