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  • WordNet 3.6
    • adj unperceivable impossible or difficult to perceive by the mind or senses "an imperceptible drop in temperature","an imperceptible nod","color is unperceivable to the touch"
    • ***
Century Dictionary and Cyclopedia
    • unperceivable Incapable of being perceived; not perceptible.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Unperceivable un-per-sē′va-bl not to be perceived
    • ***


In literature:

Or could such a ship have left the harbour unperceived?
"Margaret Tudor" by Annie T. Colcock
Now was his time to slip unperceived into the house.
"Capitola's Peril" by Mrs. E.D.E.N. Southworth
They wore but a speck on the water, and might be passed unperceived.
"Owen Hartley; or, Ups and Downs" by William H. G. Kingston
Calling his nephew Don Ordono to his side, he bade him follow unperceived, and bring back news of what befell his daughters.
"The Red Romance Book" by Various
All was silent in the chateau, and she reached her chamber unperceived.
"Fairy Fingers" by Anna Cora Mowatt Ritchie
But what I do understand is that not a movement takes place here unperceived by him.
"The Blonde Lady" by Maurice Leblanc
It might fall to the floor and be trampled unperceived.
"Blackbeard: Buccaneer" by Ralph D. Paine
We remained unperceived, though we could hear voices and footsteps on every side.
"The Escape of a Princess Pat" by George Pearson
There was no tree near, so she turned, crouched close to the ground, and attempted to steal off unperceived.
"The Watchers of the Trails" by Charles G. D. Roberts
I drew back, as I hoped, unperceived, but the eye of an Indian was too keen.
"The Privateer's-Man" by Frederick Marryat
She had seized it unperceived!
"Hopes and Fears scenes from the life of a spinster" by Charlotte M. Yonge
Just as Fanfar mounted his horse, an incident occurred which passed unperceived by the others.
"The Son of Monte Christo" by Jules Lermina
One day, while he was unperceived, his beauty became the subject of conversation.
"Eastern Tales by Many Story Tellers" by Various
Speechless with admiration I retired unperceived.
"The Mirror of Taste, and Dramatic Censor" by Samuel James Arnold
There it was set down, and, when his bride, closely veiled, left it and entered the house, he, too, entered unperceived.
"The Olive Fairy Book" by Various
He gained its shelter unperceived.
"The Duke's Motto" by Justin Huntly McCarthy
But, as it happened, that girlish scrutiny was not unperceived by Archie.
"Not Like Other Girls" by Rosa N. Carey
He gave way to the others very readily and retreated unperceived by the Squire and Mistress Fitzooth to the rear of the tent.
"Robin Hood" by Paul Creswick
Could she have glided in by me unperceived and thus found her way into the bedroom from which I afterward saw her issue?
"Room Number 3" by Anna Katharine Green
The first attack of the malady was sudden and severe, its approach being unperceived by any one, even by the sufferer.
"Wilson's Tales of the Borders and of Scotland, Volume III" by Various

In poetry:

She hears him, and can hear
With glory in his gains by work achieved:
With grief for grief that is the unperceived
In her so near.
"Earth And Man" by George Meredith
I walk'd down by a river clear,
Where hawthorn bloom'd and rosy brier;
Two lovers to the stream drew near,
Out from the grove;
I unperceived lay down to hear
Their words of love.
"Art And Nature" by Susannah Hawkins
Alert as affection, more rapid than speech,
He darts unperceived, the dear treasure to seek;
Ere the stone in it's fall the deep water can reach,
He o'ertakes; he has caught the lost gem in his beak!
"The Baya: Or The Indian Bird" by William Hayley
What female form bends hitherward her steps,
Of royal port she seems; perhaps some friends,
Rais'd by the guardian care of bounteous Heav'n
To prop the falling house of Levi. -- Soft,
I'll listen unperceiv'd; these trees will hide me.
"Moses In The Bulrushes. A Sacred Drama" by Hannah More
Errors aforetime unperceived were bared,
To be by his young masterful repaired:
Renewed his great ideas gone to smoke;
His policy confirmed amid the surge
Of States and people fretting at his yoke.
And lo, the fleet brown-flocked on the sea-verge!
"Periander" by George Meredith

In science:

Thus we have expressed the hypothetical probabilities (actually fractions of an unperceived time), for a set S of perceptions in this classical model, by Eq. (10), the trace of the product of a diagonal pro jection matrix and a diagonal density matrix.
Quantum Mechanics as a Simple Generalization of Classical Mechanics
The uncertainty on the redshift parameter z would be unperceivable at the scale of the graph.
Fitting the luminosity data from type Ia supernovae in the frame of the Cosmic Defect theory