sadist

As an adverb sadly

is in a sad manner; sorrowfully.

As a noun sadist is

sadist.

As nouns the difference between algolagnist and sadist

is that algolagnist is a sexual masochist while sadist is sadist.

As nouns the difference between compassion and sadist

is that compassion is deep awareness of the suffering of another, coupled with the wish to relieve it while sadist is sadist.

As a verb compassion

is (obsolete) to pity.

As a noun sadist

is sadist.

As an adjective undefined is

lacking a definition or value.

As a noun sadist

is sadist.

As an adjective brutal is

(senseid)savagely violent, vicious, ruthless, or cruel.

As a noun sadist

is sadist.

As a proper noun savage is

.

As nouns the difference between cuckold and sadist

is that cuckold is a man married to an unfaithful wife, especially when he is unaware or unaccepting of the fact while sadist is sadist.

As a verb cuckold

is to make a cuckold of someone by being unfaithful, or by seducing his wife.