Definition

1. Adjective:
   • Barely able to be perceived; extremely slight or subtle: Describes something so faint, small, or gradual that it is almost impossible to notice or detect with the senses.
   • Difficult or impossible to perceive or discern; indistinguishable: Describes something that cannot be clearly seen, distinguished, or separated from its surroundings or from something else.

Usage Examples

• Adjective:
  • The line between the two colors was indiscernible. (The boundary was so subtle it could not be seen.)
  • There has been an indiscernible shift in public opinion over the last month. (The change has been so gradual it is nearly impossible to measure.)
  • The ship became indiscernible in the thick fog. (The ship could no longer be distinguished from the fog.)

Advanced Usage

• "Indiscernible to the naked eye": Not visible without the aid of a microscope or other magnifying tool.
  • The microorganism was indiscernible to the naked eye.
• "Indiscernible from": So similar as to be impossible to tell apart from something else.
  • The counterfeit was virtually indiscernible from the original painting.

Variants and Related Words

• Indiscernibly (adverb): In a way that cannot be perceived.
  • The temperature increased indiscernibly over several hours.
• Discernible (adjective): The direct opposite; able to be perceived or recognized.
  • A discernible improvement in her health.

Synonyms

• Imperceptible: Impossible to perceive.
• Invisible: Unable to be seen.
• Undetectable: Not able to be discovered or identified.
• Inappreciable: Too small or insignificant to be valued or perceived.

Antonyms

• Discernible: Able to be seen or understood.
• Noticeable: Easily seen or noticed; clear.
• Obvious: Easily perceived or understood; clear.
• Pronounced: Very noticeable or marked.

Adjective

1. barely able to be perceived
   • the transition was almost indiscernible
   • an almost insensible change
2. difficult or impossible to perceive or discern
   • an indiscernible increase in temperature