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The Collaborative International Dictionary
Imperceptibly

Imperceptible \Im`per*cep"ti*ble\, a. [Pref. im- not + perceptible: cf. F. imperceptible.] Not perceptible; not to be apprehended or cognized by the senses; not discernible by the mind; not easily apprehended.

Almost imperceptible to the touch.
--Dryden.

Its operation is slow, and in some cases almost imperceptible.
--Burke. -- Im`per*cep"ti*ble*ness, n. -- Im`per*cep"ti*bly, adv.

Their . . . subtilty and imperceptibleness.
--Sir M. Hale.

Wiktionary
imperceptibly

adv. Not noticeably, too small to be detected, too little to be perceived.

WordNet
imperceptibly

adv. in an imperceptible manner or to an imperceptible degree; "the power of the Secretary of State in London increased gradually but imperceptibly" [syn: unnoticeably, observably] [ant: perceptibly]

Usage examples of "imperceptibly".

The glistening glaciered peaks moved imperceptibly closer as the range curved toward the northwest in a great arc.

Sleep imperceptibly took advantage of this happiness and relief but now, in sleep, there was no rest at all, for sleep consisted of sixty-four squares, a gigantic board in the middle of which, trembling and stark-naked, Luzhin stood, the size of a pawn, and peered at the dim positions of huge pieces, megacephalous, with crowns or manes.

I glance at Anna, who catches my eye and shakes her head almost imperceptibly, a plea to just let this go for now.

The Silesian Sea would grow imperceptibly up to the edge of the lands his friends had already purchased.

Yet, if it be true, that the sentiment of compassion is imperceptibly weakened by the sight and practice of domestic cruelty, we may observe, that the horrid objects which are disguised by the arts of European refinement, are exhibited in their naked and most disgusting simplicity in the tent of a Tartarian shepherd.

She sang and sang, her voice loud enough now to be heard over the gentling wind, and the stormdog dimmed, and then began to vanish, almost imperceptibly, as a cloud vanishes in a clear sky if you keep staring at it.

You need neither take a rest in attachments nor return to Truth, but slip imperceptibly into the stillness of boundlessness.

She had leaned almost imperceptibly forward for the briefest of instants.

As they prowled around each other, Kamahl tried to imperceptibly narrow the circle of their prowling and guide Joha toward one of the few remaining walls in the course.

He had noticed a subtle change in her all night, the shock of Olivia running away seemed to have softened her imperceptibly.

Houses and smallholdings had imperceptibly given way to scrubby thorn brush in sandy valleys that scraped itself thin at each hilltop in a vain attempt to hide the rock beneath.

But beyond it the screaming went on in volume imperceptibly muffled by its barrier, one ear-splitting caterwaul following another with such continuity that the wonder was where Lady Randolph West found breath to keep up that atrocious row, and whether any dozen women of average lung-power could have rivalled it.

Her cheekbone was represented by a rounded spur, and the spur blended almost imperceptibly with the chamfered rim of her cheek.

They watered at Flat Island, and the Boadicea and the Nereide stretched away to the cast for Rodriguez, leaving Pym in command with orders to fade imperceptibly away by night with the Iphigenia and Magicienne, leaving the Leopard and two avisoes off Port-Louis to bring instant warning if the Bellone and Minerve should return from the Bay of Bengal.

Moment by moment the event is imperceptibly shaping itself, and at every moment of this continuous, uninterrupted shaping of events the commander in chief is in the midst of a most complex play of intrigues, worries, contingencies, authorities, projects, counsels, threats, and deceptions and is continually obliged to reply to innumerable questions addressed to him, which constantly conflict with one another.