LATIN DICTIONARYLexicon Latīnum
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“abrupt” in Latin

The English word abrupt itself goes back to Latin ab, through abruptus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

abrupt
abruptus (of what sinks suddenly and perpendicularly): praeruptus (abruptly steep; but rough and craggy).
Figuratively, sudden, subitus; repentinus; non ante provisus, improvisus. etc Vid: SUDDEN. An abrupt style, abruptus sermo; abruptum sermonis genus (obscure from over-conciseness and want of connection). An abrupt beginning, abruptum initium (the vehement, impetuous beginning of an oration).

Quick answer

What is the Latin word for abrupt?
The usual Latin words for “abrupt” are abrumpō, praerumpō, subeō; also repentīnus, imprōvīsus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.