Adjective

(en-adj)

Sharp and harsh, or bitter and not to the taste; pungent.

* {{quote-magazine, date=2013-06-29, volume=407, issue=8842, page=29, magazine=(The Economist)

, title= Unspontaneous combustion , passage=Since the mid-1980s, when Indonesia first began to clear its bountiful forests on an industrial scale in favour of lucrative palm-oil plantations, “haze” has become an almost annual occurrence in South-East Asia. The cheapest way to clear logged woodland is to burn it, producing an acrid cloud of foul white smoke that, carried by the wind, can cover hundreds, or even thousands, of square miles.}}

Causing heat and irritation; corrosive.

Caustic; bitter; bitterly irritating.

Adjective

(en adjective)

Full of ardor; fervent, passionate.

* 1956 — , The City and the Stars , p 43

This ardent exploration, absorbing all his energy and interest, made him forget for the moment the mystery of his heritage and the anomaly that cut him off from all his fellows.

* {{quote-book

, year=1818 , author=Mary Shelley , title=Frankenstein , chapter=4 citation , passage=I see by your eagerness and the wonder and hope which your eyes express, my friend, that you expect to be informed of the secret with which I am acquainted; that cannot be; listen patiently until the end of my story, and you will easily perceive why I am reserved upon that subject. I will not lead you on, unguarded and ardent as I then was, to your destruction and infallible misery.}}

Burning; glowing; shining.