Ethereal vs. Unearthly — What's the Difference?

Extremely delicate and light in a way that seems not to be of this world

Unearthly is a series of young adult urban fantasy novels by American author Cynthia Hand, beginning with the inaugural entry of the same name. The story follows a teenager named Clara, who learns that she is part angel and has a purpose to fulfill on Earth.

(of a solution) having diethyl ether as a solvent

Not of this earth; preternatural; supernatural.

Extremely light or delicate

Unnaturally strange and frightening.

Of the celestial spheres; heavenly.

Ridiculously unreasonable or uncustomary; absurd

Spiritual or otherworldly.

Not of the earth; non-terrestrial.

(Chemistry) Of or relating to ether.

Preternatural or supernatural.

Pertaining to the (real or hypothetical) upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere.

Strange, enigmatic, or mysterious.

Pertaining to the immaterial realm, as symbolically represented by, or (in earlier epochs) conflated with, such atmospheric and extra-atmospheric concepts.

Ideal beyond the mundane.

Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.

Ridiculous, ludicrous, or outrageous.

(organic chemistry) To do with diethyl ether.

Not terrestrial; supernatural; preternatural; hence, weird; appalling; terrific; as, an unearthly sight or sound.

Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; as, ethereal space; ethereal regions.

Concerned with or affecting the spirit or soul;

Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.

Suggesting the operation of supernatural influences;

Pertaining to, derived from, or resembling, ether; as, ethereal salts.

Characterized by lightness and insubstantiality; as impalpable or intangible as air;

Of or containing or dissolved in ether;

Of heaven or the spirit;

Characterized by unusual lightness and delicacy;