indiscernibly

Without noticeable difference

In a way that cannot be perceived or distinguished.

Something changes indiscernibly when the change is too subtle or gradual to detect: The sun moved indiscernibly across the sky.

Two things differ indiscernibly when no observable distinction exists between them: The copies were indiscernibly different from the originals.

imperceptibly

invisibly

Without being seen

subtly · gradually · slightly · softly · gently · unobtrusively · undetectably · insensibly · marginally · faintly

minute

infinitesimal

Quantity approaching zero

nanoscopic · atomic · molecular · negligible · fractional · trace · hairsbreadth · imperceptible · scintilla · iota

subtle

nuanced

Having fine distinctions

refined · imperceptible · tenuous · subliminal · fine · slight · faint · implicit · intangible · ethereal

faint

whisper

Speech without full voice

flicker · haze · blur · wisp · hint · trace · suggestion · ghost · shadow · echo

hidden

concealed

Made invisible deliberately

camouflaged · cloaked · shrouded · covert · unseen · undetected · latent · secretive · undisclosed · unrevealed

Opposites
perceptibility/detectability

indiscerniblydiscernibly

In observable manner

perceptibly · noticeably · visibly · detectably · clearly

Family

indiscernible

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