Subitaneous [adjective]

● Abrupt

● Breakneck

● Brief

● Frantic

● Harum-scarum

● Hasty

● Headlong

● Heedless

● Hurried

● Ill-advised

● Impatient

● Impetuous

● Indiscreet

● Jump the gun

● Madcap

● Quick

● Rapid

● Rash

● Reckless

● Refractory

● Rushing

● Swift

● Uncontrolled

● Unexpected

● Unforeseen

● Violent

● Willful

● Plunging

● Precipitant

● Gone off half-cocked

● Off the hip

● Off the top of head

● Unanticipated

● Without warning

● Slow

● Cautious

● Careful

● Subitaneous

● Sudden

● Momentaneous

● Ictic

● Temporaneous

● Eous

● Abrupt

● Ferly

● Intempestive

● Subventaneous

● Fulmineous

● Blastment

● Ultroneous

● Unexpected

● Presentaneous

● Coinstantaneous

● Unseasonableness

● Motific

● Proletaneous

● Flammeous

● Vimineous

● Anguineous

● Precedaneous

● Sensifacient

● Disvantageous

● Dispiteous

● Intempestively

● Extrageneous

● Ethereous

● Cold wave

● Extumescence

● Subsultus

● Rampageous

● Chargeous

● Catch cold

● Circumterraneous

● Deuteropathy

● Terreous

● In haste

● Startlish

● Floccillation

● Untimeously

● Facere

● Crop up

● Algific

● Burst out

● Circumforaneous

● Loss of consciousness

● Incalescent

● Peracute

● Estuation

● Sensific

● Torose

● Vulnerate

● Night blindness

● Exterraneous

● Selcouth

● Exsanguineous

● Bring forward

● Momentany

● Fainty

● Procatarxis

● Act of god

● Heartstricken

● Despiteous

● Unforeseen

● Infaust

● Precipitous

● Inducteous

● Change of location

● Fragor

● Electrical discharge

● Strange

● Sinistrorsal

● Equitemporaneous

● Unhasty

● Madbrain

● Sloomy

● Consequent

● Untimely

● Unexplained

● Commove

● Declinable

● Windfallen

● Facient

● Thermosystaltic

● Declivitous

● Cereous

● Tetanomotor

● Turningness

● Estuate

● Inexplicable

● Gypseous

● Albugineous

● Milk sickness

● Stamineous

● Move involuntarily

● Intempestivity

● Acetifier

● Foraneous