Qualities

Synonyms for fast

Synonyms for fast: quick and firm. Every one of them is a hand audited pair from the Synonym Stack word bank, shown below in the sense it fits, in a real sentence, and beside the words that only look close.

2 synonyms · Tier 1, Foothills · 1 sense · adjective · 1 reason line · a wrong tile in 2 puzzles

The 2 synonyms for fast

Interchangeable with fast in this sense

Audited under fast's own entry, so the meaning quoted is the one fast carries in that sense.

quickadjective, in the sense "hurried and brief"

Recorded from the other side of the pair

These entries were written under the other word and name fast as the true synonym, so the sense quoted is theirs.

firmfirm is an adjective in the sense "unwavering in devotion to friend or vow or cause"

Two directions, one standard: one audited under fast and one under the partner word. Nothing here was expanded out of a thesaurus.

The senseadjectiveTier 1, FoothillsQualities

hurried and brief

A fast visit.

The context the game gives you. The gloss above is for readers here, not for players there.

The true synonym

quick

Same sentence, swapped: A quick visit.

Close but different

These three are the other tiles the game puts on screen for this sense, and the note above says why the closest of them fails. None is a synonym for fast in the sentence quoted.

firm
degenerate
sound

Where fast turns up in the game

fast is the word under test in one puzzle, at Tier 1, Foothills. It also sits on the board as one of the three wrong tiles in two other puzzles, where the answer is a different word entirely.

The puzzles where fast is the trap

soundadjective, Tier 1, Foothills. The answer there is good, in the sense "in excellent physical condition", with fast sitting one tile away.
freeadjective, Tier 3, Ridgeline. The answer there is detached, in the sense "not fixed in position", and fast is on the board beside it.

Play fast

The bank on this page is the bank the game plays from, so fast reaches you as a board rather than a definition: the sentence first, four tiles, and the meaning after you choose.

Get Synonym Stack free Already installed? Open Synonym Stack

Free with ads on iPhone. Synonym Stack Plus removes them: $2.99 a week, $5.99 a month or $49.99 a year, with a 7 day free trial on the monthly and annual plans.

Compiled by Fable, Editor, Synonym Stack

This page is built from Open English WordNet 2025, with the sense, the sentence, the tier and the near misses read by a human in the July 2026 audit. No sentence here is generated at deploy time.

Read nextThe whole library →

The ring widens as it goes, from qualities at Foothills outward to the whole bank.

firmadjectivefastunwavering in devotion to friend or vow or causeFoothills2 senses fitadjective, nounseton the point of or strongly disposedFoothills2 sensesHas a reason line fixedadjectivefrozenincapable of being changed or moved or undoneFoothills forcenounstrengthphysical energy or intensityFoothills2 senses pooradjectiveshortof insufficient quantity to meet a needFoothills posturenouncarriagecharacteristic way of bearing one's bodyRidgelineHas a reason line potentadjectivestronghaving a strong physiological or chemical effectRidgelineHas a reason line gangnounmoban organized group of people who act together, often for criminal purposes.FoothillsHas a reason line

A reason under every answer, not just a right answer

Synonym Stack plays from this exact bank. fast carries 1 written reason line, and the game shows them the moment a round ends, whichever tile you tapped.

Get Synonym Stack freeFree with ads on iPhone. Synonym Stack Plus removes them: $2.99 a week, $5.99 a month or $49.99 a year, with a 7 day free trial on the monthly and annual plans.