Ultrareliable

Part of speech: adjective

Definitions

1. Distinguished by an extraordinary level of trustworthiness, especially in crucial circumstances
2. Marked by a consistent ability to operate effectively and efficiently, particularly in high-pressure scenarios
3. Exhibiting an exceptional degree of dependability under all conditions

Etymology: "Ultrareliable" is simply the prefix "ultra-" joined to "reliable." The prefix comes from Latin "ultra," meaning "beyond" or "on the far side of," and in English it has long been used to mark something extreme or beyond the usual degree. Attaching it to "reliable" produces a compound meaning dependable to an exceptional extent, one that goes past ordinary trustworthiness. Both parts are older than the compound itself. "Reliable" was formed in English from "rely" and the suffix "-able," meaning capable of being relied upon, and the "ultra-" prefix was used in English to form many such intensifying words. The result is a transparent coinage: the word says exactly what it means, with no shift in sense from its parts.

Synonyms: extremely dependable, highly trustworthy, super reliable, infallible, unfailing

Antonyms: unreliable, untrustworthy, inconsistent, erratic, faulty