stern

Unsparing is a related term of stern.

As an adjective unsparing

is without sparing.

As a noun stern is

a star; a small luminous dot that can be seen on the night sky.

As adjectives the difference between stern and rigorous

is that stern is having a hardness and severity of nature or manner while rigorous is manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.

As a noun stern

is the rear part or after end of a ship or vessel.

Stern is a related term of determined.

As a noun stern

is a star; a small luminous dot that can be seen on the night sky.

As an adjective determined is

decided; resolute, possessing much determination.

As a verb determined is

(determine).

Stern is a related term of inexorable.

As a noun stern

is a star; a small luminous dot that can be seen on the night sky.

As an adjective inexorable is

unable to be persuaded; relentless; unrelenting.

Stern is a related term of inhuman.

As a noun stern

is a star; a small luminous dot that can be seen on the night sky.

As an adjective inhuman is

of or pertaining to inhumanity and the indifferently cruel, sadistic or barbaric behavior it brings.

Stern is a related term of ascetic.

As nouns the difference between stern and ascetic

is that stern is a star; a small luminous dot that can be seen on the night sky while ascetic is one who is devoted to the practice of self-denial, either through seclusion or stringent abstinence.

As an adjective ascetic is

of or relating to ascetics; characterized by rigorous self-denial or self-discipline; austere; abstinent; involving a withholding of physical pleasure.

Stern is a related term of heartless.

As a noun stern

is a star; a small luminous dot that can be seen on the night sky.

As an adjective heartless is

without a heart; specifically, without feeling, emotion, or concern for others; uncaring.

Stern is a related term of fiendish.

As a noun stern

is a star; a small luminous dot that can be seen on the night sky.

As an adjective fiendish is

sinister; evil; conniving; in the manner of a fiend.

Stern is a related term of hardhearted.

As a noun stern

is a star; a small luminous dot that can be seen on the night sky.

As an adjective hardhearted is

lacking in compassion; cold and pitiless.