impassive

As a letter s

is the letter s with a.

As an adjective impassive is

having, or revealing, no emotion.

Coldhearted is a related term of impassive.

As adjectives the difference between coldhearted and impassive

is that coldhearted is while impassive is having, or revealing, no emotion.

Impassive is a related term of inured.

As an adjective impassive

is having, or revealing, no emotion.

As a verb inured is

(inure).

As adjectives the difference between impassive and splendid

is that impassive is having, or revealing, no emotion while splendid is possessing or displaying splendor; shining; very bright; as, a splendid sun.

As adjectives the difference between impassive and false

is that impassive is having, or revealing, no emotion while false is (label) one of two states of a boolean variable; logic.

As adjectives the difference between impassable and impassive

is that impassable is incapable of being passed over, crossed, or negotiated while impassive is having, or revealing, no emotion.

As adjectives the difference between impassive and immutable

is that impassive is having, or revealing, no emotion while immutable is unable to be changed without exception.

As a noun immutable is

something that cannot be changed.

As adjectives the difference between impassive and undefined

is that impassive is having, or revealing, no emotion while undefined is lacking a definition or value.

Impassive is a related term of nonresistant.

As adjectives the difference between impassive and nonresistant

is that impassive is having, or revealing, no emotion while nonresistant is not resistant.

As adjectives the difference between impassive and taciturn

is that impassive is having, or revealing, no emotion while taciturn is silent; temperamentally untalkative; disinclined to speak.