undetectable

Thân thiện

The spy's device was completely undetectable.

Definition

Adjective: 1. Impossible or extremely difficult to discover, find, or notice: Something that is undetectable cannot be perceived or identified by the senses or by scientific instruments. 2. Barely able to be perceived; extremely faint or slight: Something that is present but in such a small amount or degree that it is almost impossible to sense or measure.

Usage and Examples

• Describing something that cannot be found or noticed:
  • The spy used an undetectable poison. (The poison could not be discovered by any test.)
  • The virus was undetectable in his blood after treatment. (Medical tests could not find the virus.)
• Describing something extremely faint or slight:
  • There was an undetectable trace of perfume in the air. (The scent was so faint it could barely be smelled.)
  • The difference in sound quality was undetectable to the average listener. (The difference was so slight that most people could not hear it.)

Advanced Usage

• Scientific and Technical Contexts: Often used to describe quantities or signals below the threshold of measurement for current technology.
  • The particle's charge was undetectable with the equipment available.
• Figurative Use: Can describe abstract qualities that are not apparent.
  • His anxiety was almost undetectable beneath his calm exterior.

Variants and Related Words

• Undetectably (adverb): In a manner that cannot be detected.
  • The substance dissolves undetectably in water.
• Detectable (adjective): The direct opposite; able to be discovered or perceived.
• Indiscernible (adjective): Impossible to see or clearly distinguish.
• Imperceptible (adjective): Impossible to perceive by the senses or mind.

Synonyms

• Unnoticeable
• Invisible
• Inaudible (for sound)
• Impalpable
• Inappreciable

Antonyms

• Detectable
• Noticeable
• Obvious
• Apparent
• Perceptible

Notes on Meaning

The word "undetectable" can describe two related but distinct states: 1. An absolute state where something cannot be detected by any available means. 2. A relative state where something is present in such a minute or subtle form that it practically cannot be detected by ordinary means, aligning closely with the reference context of being "barely able to be perceived." The intended meaning is often clarified by the context.

Học thuật

Adjective

1. barely able to be perceived
   • the transition was almost indiscernible
   • an almost insensible change
2. not easily seen

Từ đồng nghĩa

• indiscernible
• insensible