What does indiscernibly mean?
Indiscernibly means in a way that cannot be perceived or distinguished. It is used primarily when two things differ only so slightly that the difference cannot be identified, whether because of their size, subtlety, concealment, or the limitations of a particular sense. For example, two colors may be indiscriminably similar under ordinary lighting, while a small change in a recording may be indiscriminably audible only through specialized equipment. The adverb is formal and more precise than simply saying that something is "hard to see," since it specifically describes an imperceptible difference. Its formation from "indiscernible" also gives it the sense of being beyond the limits of observation rather than merely overlooked. Indiscernibly is especially useful in scientific, legal, and analytical writing, where the significance of a tiny difference must be expressed accurately.
adverbIn a way that cannot be perceived or distinguished, especially because a difference is too small or subtle to identify.
- In a manner that cannot be perceived or distinguished.
"At that distance, the two shades of blue are almost indiscernibly similar."
"The medication altered her voice so slightly that the change was almost indiscernibly subtle."
"Under magnification, the two mineral samples remained indiscernibly alike."
Some differences are not absent; they are simply too subtle for the human eye to separate.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does indiscernibly come from?
Indiscernibly is the adverbial derivative of the adjective indiscernible. These words belong to a family based on Latin discernere, meaning "to separate" or "to distinguish," which comes from dis-, indicating separation, and cernere, meaning "to perceive or observe." The prefix in- before discern- expresses negation, producing the idea of something that cannot be distinguished. The English cognates discern, discerning, and discernible share the same historical root.
Related word forms
How indiscernibly is actually used
This is a formal adverb used especially for differences that are extremely small, subtle, or otherwise impossible to distinguish. It is less common in informal speech, where "barely noticeable" or "almost impossible to tell apart" may be more natural.