callous

As an adjective callous is

emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

As adjectives the difference between disdainful and callous

is that disdainful is showing contempt or scorn; having a pronounced lack of concern for others viewed as unworthy while callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

As adjectives the difference between deliberate and callous

is that deliberate is done on purpose; intentional while callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

As a verb deliberate

is to consider carefully.

Callous is a related term of inured.

As an adjective callous

is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

As a verb inured is

(inure).

Unsympathetic is a related term of callous.

As adjectives the difference between unsympathetic and callous

is that unsympathetic is not sympathetic while callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

As adjectives the difference between regardless and callous

is that regardless is having no regard; heedless; careless while callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

As an adverb regardless

is without attention to warnings or indications of bad consequences.

As a preposition regardless

is paying no attention to; regardless of.

As adjectives the difference between calculating and callous

is that calculating is which has the ability to calculate while callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

As a verb calculating

is present participle of lang=en.

Callous is a related term of harsh.

As adjectives the difference between callous and harsh

is that callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others while harsh is unpleasantly rough to the touch or other senses.

As a verb harsh is

(slang) to negatively criticize.

Unemotional is a related term of callous.

As adjectives the difference between unemotional and callous

is that unemotional is showing little or no feeling while callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

Relentless is a related term of callous.

As adjectives the difference between relentless and callous

is that relentless is unrelenting or unyielding in severity while callous is emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.