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gen.
sudden (happening etc. quickly and unexpectedly) ; unexpected (not expected, e.g. because sudden • his unexpected death; His promotion was quite unexpected ) ; rude ; heady ; unheralded (Anglophile ) ; unlooked-for (Anglophile ) ; bombshell ; extemporaneous ; extemporary ; forceful ; saltative (о перемещении осадков) ; surprise ; unexpectable (Vadim Rouminsky ) ; abrupt (sudden; unexpected • The car came to an abrupt halt ) ; snap ; unannounced (Abysslooker ) ; flashy ; sharp ; short ; short winded ; on the spur of the moment ; unhoped ; overnight (He was an overnight success )
Игорь Миг
off-the-cuff ; fluke ; undreamt-of
amer.
snap (о действии • it was a snap action on his part Val_Ships )
astronaut.
sporadic
austral., slang
zip
avia.
ictal (о припадке)
biol.
subitaneous
construct.
abrupt (напр., о порыве ветра)
econ.
windfall
elev.
immediate (ladyjane85 )
inf.
quickie
Makarov.
extempore ; flash ; flush (воды) ; precipitate ; saltatory (о перемещении осадков)
med.
impulsive
mil., obs.
dead
mil., tech.
instantaneous
mining.
abrupt
obs.
sudden ; inopinate
polit., inf.
pop-up
qual.cont.
abrupt (об отказе)
space
unexpected
tech.
explosive
gen.
all at once (suddenly • All at once the light went out ) ; plop ; plump ; pop ; short ; snap ; astart ; bounce ; all standing ; in a clap ; on a sudden ; finish slap ; sudden ; overnight (MargeWebley ) ; all of sudden ; bump ; from one day to the next (if something changes from one day to the next, it changes suddenly; Macmillan dictionary curious ) ; on impulse ; without warning (Pickman ) ; out of nowhere (slitely_mad ) ; suddenly ; all of a sudden (suddenly or unexpectedly) ; on a whim (Major governmental policies cannot be decided on a whim; they have to be carefully and rationally thought through vogeler ) ; abruptly ; harshly (Aly19 ) ; spontaneously (Василий 1983 ) ; unexpectedly ; at unawares ; in the night ; plumb (о падении тел) ; poop ; sharply ; of a sudden ; upon a sudden ; right out of the blue ; out of the blue (without warning) ; abruptly (А.А. Китаева )
austral., slang
at the drop of a hat
idiom.
just like that (Andrey Truhachev ) ; like a bolt from the blue (The news came to us like a bolt from the blue. Val_Ships ) ; like a bat out of hell ; here's the kicker (Vadim Rouminsky ) ; on a whim (because of a sudden decision (Merriam-Webster) -- не подготовившись • Bouncers asking for cash to enter clubs -- is this the new normal? Friends and I decided to go out Saturday night on a whim. -- внезапно решили пойти в ночной клуб • This sounds incredibly stupid. It's not something you do on a whim. Those services are essential and you can't just pull the plug and hope the public system can somehow instantly fill the gaps. (Reddit) ART Vancouver )
inf.
bob ; slap ; bang
ironic.
SADS (мед. MichaelBurov ) ; Sudden Adult Death Syndrome (SADS, мед. MichaelBurov )
Makarov.
out of the blue ; rudely
med.
abruptly (о начале заболевания • The patient becomes ill abruptly... Damir Bikmuhametov )
med., ironic.
suddenly (SADS MichaelBurov )
mus.
subito
obs.
suddenly ; all of a sudden
slang
on the spur of the moment
tech.
unexpectedly
gen.
subitamente (нотное указание: внезапная смена динамического оттенка)
theatre., mus.
subito (нотное указание: внезапная смена динамического оттенка)
Russian thesaurus
ironic.
синдром внезапной необъяснимой смерти взрослых (SADS MichaelBurov )