What does soonest mean?
Soonest is the superlative form of the adverb “soon.” It means that something will happen at the earliest possible time or more quickly than anything else in a particular group. The phrase “at the soonest” is common in correspondence and workplace communication, where it indicates a deadline without specifying an exact time: “Your response is required at the soonest.” The word can also describe the fastest available option, as in “the soonest route to central London.” Although grammatically regular, “soonest” can sound old-fashioned when used alone, especially in British English, because speakers now tend to prefer “as soon as possible” or the comparative “sooner.” It remains useful in formal requests, schedules, and contexts where concision is important.
At or before the earliest possible time; sooner than any other time.
"We should leave now if we want to arrive soonest."
Especially common in the set phrase “at the soonest.” Elsewhere, “as soon as possible” is often more idiomatic.
Earliest in time or quickest in speed.
"We took the soonest route through town."
Often used predicatively rather than before a noun.
The soonest way to say “as soon as possible” without leaving the reader guessing.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does soonest come from?
The word was formed in Middle English by adding the superlative suffix “-est” to “soon.” “Soon” itself comes from Old English sōna, meaning “at once” or “without delay,” and ultimately relates to Old High German sāna, used with similar meaning. The modern superlative therefore continues an older pattern of forming comparisons with suffixal endings.
How soonest is actually used
In formal and professional contexts, “at the soonest” is especially common: “The report is needed at the soonest by Friday.” In everyday speech, “as soon as possible” is usually more natural.