"Pristine" means unspoiled, perfect, or untouched.

"Solid" means hard, firm or stable. "Solid" is also a noun that means the state of matter that is not liquid or gas.

"Defunct" means not functioning or nonexistent.

"Tainted" means impure, dirty, or contaminated.

"Beautiful" means pleasing to the senses or physically attractive.

"Noxious" means harmful, poisonous or something that will cause injury or death.

"Delicious" means very tasty, delightful or pleasant.

"Gaseous" means gas-like, or describes something that is in the form of gas or vapor.

"Beneficial" means good, helpful or useful.

"Opulent" means excessively luxurious, or ostentatious.

"Gnarled" means misshapen, or knobby and lumpen. The word is often used to describe the quality of wood.

"Pneumatic" means related to air or compressed gas. For example, a pneumatic cannon is a cannon powered by compressed air. 

"Translucent" means clear or something you can see-through.

"Incoherent" means confused or difficult to understand.

"Granular" means composed of small granules or particles.

"Sour" and "tart" both describe a mouth-puckering taste. "Swarthy" means dark-skinned, "husky" means strong and robust, and "quizzical" means puzzled. "Sweet" and "sour" are generally considered antonyms.

"Luxurious" and "deluxe" both mean extremely elegant and comfortable. "Infamous" means notorious, and "numeric" means relating to numbers. "Perfect" and "flawed" are antonyms. While "luxurious" items are often "expensive," the two are not synonymous.

"Scummy" and "dirty" are synonyms. "Decisive" is the opposite of both indecisive and wavering. "Elaborate" means complex or complicated. To "quiver" is to shake.

"Ruddy" means red and is usually used to describe a complexion. The rest of the words are colors as well: "copper" is a metallic brown,"viridian" is green, "cerulean" is blue, and "olive" is a yellowish-green color.

"Gruesome" and "grisly" both mean repulsive and horrible. To "yield" is to give in. To be "nosy" is to pry into other people's business. "Shy" means timid, and "handsome" means physically attractive and is usually used to describe men.

"Grotesque" and "deformed" both mean physically misshapen. "Ancient" means very old, and "religious" describes something related to or ascribing to a religion. To "interrogate" is to ask questions. "Praiseworthy" means deserving of praise or approval; meritorious.

"Feathery" and "wispy" are synonyms. "Elegy" and "eulogy" are not adjectives at all; they are speeches that people deliver upon the death of a friend or relative. "Terrestrial" means of the earth. While an "aviary" is a place that birds live, it is not related to feathers and is therefore not a good synonym.