Meaning: Salubrious is something healthy or pleasant.
Example: I know a salubrious place which is pedestrian-only.
Synonyms: Healthy, Beneficial, Good, Hygienic
Antonyms: Unhealthy, Insalubrious, Unwholesome

Meaning: Insubordinate is someone who is not submissive to authority.
Example: All those insubordinate boys must be punished.
Synonyms: Rebellious, Contrary, Defiant, Disaffected
Antonyms: Obedient, Compliant, Behaved

Meaning: Irascible is quick-tempered, easily-angered.
Example: It is a very quick and highly irascible beast.
Synonyms: Cranky, Feisty, Surly, Uptight, Crabby
Antonyms: Cool, Happy, Pleasant, Cheerful

Meaning: Gloom is a hazy darkness or dimness.
Example: The gloom of a moonless autumn evening is perfect.
Synonyms: Melancholy, Despair, Grief, Misery, Anguish, Sorrow
Antonyms: Cheer, Delight, Gladness, Joy, Pleasure

Meaning: Grisly means disgusting and bloody, repulsive and horrible.
Example: This story is about a man who suffers a grisly death at the hands of the grizzly bears.
Synonyms: Bloody, Dreadful, Eerie, Ghastly
Antonyms: Beautiful, Comforting, Delightful, Pleasant