Not distinguishable; not capable of being perceived, known, or discriminated as separate and distinct; hence, not capable of being perceived or known; as, in the distance the flagship was indisguishable; the two copies were indisguishable in form or color; the difference between them was indisguishable.
- Not distinguishable, especially:
- Impossible to differentiate or tell apart: indistinguishable twins; markings that make a moth indistinguishable from its background.
- Impossible to discern; imperceptible: a sound that was indistinguishable to the human ear.
- Difficult to understand or make out; vague: indistinguishable speech.