Adjective

(en adjective)

Equal to some requirement; proportionate, or correspondent; fully sufficient; as, powers adequate to a great work; an adequate definition lawfully and physically sufficient.

* De Quincey

Ireland had no adequate champion.

* Sir Arthur Conan Doyle, The Adventure of the Empty House

All day, as I drove upon my round, I turned over the case in my mind and found no explanation which appeared to me to be adequate .

Adjective

(en adjective)

(not comparable) Being the only one of its kind; unequaled, unparalleled or unmatched.

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* {{quote-book, year=1963, author=(Margery Allingham)

, title=(The China Governess) , chapter=3 citation , passage=‘[…] There's every Staffordshire crime-piece ever made in this cabinet, and that's unique . The Van Hoyer Museum in New York hasn't that very rare second version of Maria Marten's Red Barn over there, nor the little Frederick George Manning—he was the criminal Dickens saw hanged on the roof of the gaol in Horsemonger Lane, by the way—’}}

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Of a feature, such that only one holder has it.

Particular, characteristic.

* '>citation

(proscribed) Of a rare quality, unusual.

* {{quote-book, passage=And as I look back, it seems to me that we were fairly unique , the sixty of us, in that there wasn’t one good mixer in the bunch.

, title=For Esmé—With Love and Squalor , author=J.D. Salinger , year=1950}}