imperceptibly

imperceptible | American Dictionary

imperceptible
adjective[ not gradable ]
us/ˌɪm·pərˈsep·tə·bəl/
(of an action or change) so slight that it cannot be noticed:
When they brought her in to the emergency room, her breathing was imperceptible.

imperceptibly

adverbus/ˌɪm·pərˈsep·tə·bli/
Imperceptibly, the day grew darker.

Examples of imperceptible

imperceptible
But what would confer an adaptive advantage on a syntactic faculty that just generated meaningless and imperceptible syntactic structures?
Culture, which is supposed to be the focus of archaeological investigations is imperceptible in principle.
The visible action is, in effect, like a series of still photographs with transitions between them (although the 'stills' may be almost imperceptible).
By small, imperceptible increments, new technologies have given us expanded possibilities in life while creating new unforeseen problems rarely considered while adopting new technology.
You could, of course, reply that this being an exceptional situation (as it is in this example), the toll on overpopulation would be imperceptible.
My account of the evening cannot, however, do justice to the tactical facades - the bluffs, grand postures, and imperceptible dodges - so common to tournament settings.
Yet the transformations are not metamorphic but evolutionary: changes apparently imperceptible are occurring nevertheless, and consequently the final result may be more far-reaching, because unsuspected.
Even from the victim's point of view, the overall perceptible increase in pain might be traced to the imperceptible effects of the individual acts.
According to this image, all natural bodies, even minerals, are animate and conceal imperceptible "spiritual forces" behind their corporeal, visible shells.
Change in teacher candidates is gradual and often imperceptible and is impacted by diverse developmental events that occur during professional preparation.
A similar constitution takes place in the search for a hitherto imperceptible entity such as scientific research aims at discovering.
The visible comprises material or natural, objective, historical, and geographical components, whereas the invisible encloses what is spiritual, unknowable, imperceptible, and existent withstanding its absence.
He did not rule out selection of discontinuous variants, but he replaced the emphasis on the slow accumulation of individually imperceptible differences.
The ice can be eroded from currents underneath, which is often imperceptible at the surface.
Previously imperceptible inner-polyphonies and harmonic sound-fields of unfolding inner resonance spaces now become audible.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.