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Douglas Harper's Etymology Dictionary
unidentifiable

1859, from un- + identifiable.

Wiktionary
unidentifiable

a. Difficult, if not impossible, to identify or name

WordNet
unidentifiable

adj. impossible to identify [ant: identifiable]

Usage examples of "unidentifiable".

He had recently discovered some recordings of Dardanian music, and now, even as he worked, he was listening to the sounds of unidentifiable instruments, untraceable melodies.

Chris gave in, and they entered the shaft and began moving outward along the inside face of the south disk of the Decoupler, They had lost track of distance when they came to a point where the shaft was blocked by some unidentifiable machinery that looked as if it had been installed by Spartacus.

There, under a canvas tent, on a portable television with sound drowned out by a gas-powered generator the size of a small munitions plant, the three of them watched a grainy, unidentifiable machine bump up against an even grainier, more unidentifiable landscape.

Cocoons of leeches and other unidentifiable creatures clustered thick on the trunks, like pale, bloated leaves.

As Data stood up from his post and turned, a ringlike device materialized on the deck beside him, so unidentifiable that nobody did anything but stare at it for an important second.

Data stood up from his post and turned, a ringlike device materialized on the deck beside him, so unidentifiable that nobody did anything but stare at it for an important second.

Blythe gazed down at her plate of blackened meat and an unidentifiable large rootlike vegetable with what she suspected was a dazed expression.

She sketched out a rectangle to indicate each tabletop, then began noting the melted beakers, titration tubes, volumetric flasks, and other items still unidentifiable.

The suspension towers rose like the bones of some incalculably huge dinosaur above deserted asphalt lanes and side gantries lined with unidentifiable detritus.

There were small hard apples, sweet and spicy wild carrots, peeled, gnarled roots of starchy groundnuts, pitted dried cherries, dried but still green day-lily buds, round green milk vetch dried in the pod, dried mushrooms, dried stalks of green onions, and some unidentifiable dried leaves and slices.

Two more days of searching and sifting through sand and pebbles, brought forth two strawberry-size rubies and a three-foot-long fragment of one of the carved masts lodged in a stand of rushes plus another curious elf device which was altogether unidentifiable.

Then the unidentifiable strangeness that had been creeping moldlike across the windows resolved itself and it was night.

The room itself was virtually featureless save for a few unidentifiable protrusions and one large oval recess of indeterminate purpose set high up on the far wall.

His room faced out on the plaza, and the not-quite-familiar smells of trodden fruit and vegetables filled the room along with other, unidentifiable aromas.

He dressed quickly, put the gun in his pocket, rode the elevator down to the lobby, walked across the street, found a properly nondescript and unidentifiable vidphone booth, and called Magnussen at his home.