Ultroneous

(adjective)

Meaning: Voluntary or spontaneous; done by choice.

Example: His ultroneous efforts to help the community were widely appreciated.

Synonyms: voluntary, willing, spontaneous

Antonyms: involuntary, coerced, forced

Vernal

(adjective)

Meaning: Relating to spring; fresh and new.

Example: The vernal flowers bloomed beautifully in the garden.

Synonyms: spring-like, youthful, fresh

Antonyms: autumnal, wintry, old

Whipsaw

(verb)

Meaning: To cause someone to experience two opposing situations simultaneously.

Example: The company's policies seemed to whipsaw employees between security and uncertainty.

Synonyms: oscillate, fluctuate, confuse

Antonyms: stabilize, steady, calm

Xanthic

(adjective)

Meaning: Yellow or relating to a yellow color.

Example: The xanthic hue of the leaves signaled the change of seasons.

Synonyms: yellow, golden, saffron

Antonyms: colorless, pale, ashen

Yondermost

(adjective)

Meaning: Furthest away; remote.

Example: They traveled to the yondermost reaches of the island.

Synonyms: farthest, most distant, outermost

Antonyms: nearest, closest, adjacent