Undetectables

Part of speech: adjective, noun

Definitions

1. Referring to things or individuals that cannot be identified, discovered, or perceived by any means; describing undiscernible elements in scientific, medical, or security contexts; pertaining to conditions or items that evade standard detection methods
2. Characterizing objects, substances, or phenomena that remain hidden from observation or measurement; relating to pathogens or particles below the threshold of current technologies; indicating the status of being invisible to tests or sensory instruments
3. Denoting entities or factors that escape detection by devices or senses; used in medical terms for viral loads or bacteria that are not measurable; involving stealth or invisibility in both physical and metaphorical senses

Etymology: "Undetectables" is the plural of "undetectable," which is an adjective formed from "detect" plus the prefix "un-" and the suffix "-able." "Detect" came into English in the 1400s from Latin "detectus," the past participle of "detegere," meaning "to uncover" or "to remove the covering from," built from "de-" (away, off) and "tegere" (to cover). The Latin sense of uncovering is still visible in the word: to detect something is to strip away whatever hides it. The adjective "undetectable" is a later formation, built on English materials, and it appears in the 1800s. When it is used as a noun, as in "the undetectables," it is a standard conversion: an adjective used as a noun to name a class of things, such as the undetectable chemicals or undetectable devices it describes. Its plural simply follows the regular English pattern of adding "-s."

Synonyms: invisible, hidden, unnoticeable, concealed, unseen

Antonyms: detectable, visible, noticeable, apparent, obvious