Definition of imperceptible in English:

imperceptible

adjective

  • So slight, gradual, or subtle as not to be perceived.

    ‘his head moved in an almost imperceptible nod’
    • ‘He lived in a world of fine gradations and imperceptible shades.’
    • ‘The gradient is, to a walker, an imperceptible one in 50.’
    • ‘Almost imperceptible on screen, it is actually made up of tiny chickens' feet and is repeated on the buttons of her dress.’
    • ‘The law now seems clear, however, that so long as the change is gradual and imperceptible the doctrine applies.’
    • ‘There was an almost imperceptible shuffle on the stairs.’
    • ‘On these repeat visits, subtle qualities gradually reveal themselves which were initially almost imperceptible.’
    • ‘Without museums, the skills of the sculptor and the various dialects of tribes in the country would have been imperceptible now, he said.’
    • ‘The impact would be nearly imperceptible at first, but it'd be there, and significant enough to gum things up.’
    • ‘My shadow, briefly cutting sunlight, changes the land's chemistry in imperceptible ways that make us one.’
    • ‘I could hear the call going along the line, but then at the final moment, instead of ringing, there was a strange, almost imperceptible hiccup.’
    • ‘The line between rock musicians and seven-year-olds is often imperceptible.’
    • ‘If that's not the case - well, it's a lot of money to spend on what, for me, turned out to be an almost imperceptible difference.’
    • ‘Yet the incursions on free speech can be insidious and imperceptible.’
    • ‘By appearance it's an almost imperceptible, narrow slot in the pavement that runs alongside a sidewalk from the bottom to the top of a hill.’
    • ‘I think there's an imperceptible incline, which makes sense as I was following the river upstream, so no cruising.’
    • ‘As for the winters, though, I find I relish them, and can't imagine living anywhere in which the seasons are so slight as to be imperceptible.’
    • ‘It was subtle, almost imperceptible from where we were sitting, but I noticed it and so did Lori.’
    • ‘You put things out in the world hoping that it might be relevant to someone, but these things are subtle, imperceptible.’
    • ‘A slight almost imperceptible vibration of the vessel was felt.’
    • ‘She stole a glance at him and he gave her an almost imperceptible nod.’
    unnoticeable, undetectable, indistinguishable, indiscernible, unapparent, inappreciable, invisible, inaudible, impalpable, unobtrusive, impossible to detect
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Origin

Late Middle English: from French, or from medieval Latin imperceptibilis, from in- ‘not’ + perceptibilis, from the verb percipere (see perceive).

Pronunciation

imperceptible

/ɪmpəˈsɛptɪb(ə)l/