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“blunder” in Latin

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

blunder s.
mendum (offence against a rule to be observed, a proper form, etc., especially mistakes in writing, calculations, etc.): error, erratum (mistake made from ignorance or inadvertency; of a workman, erratum fabrile (Cic.): erratum, opposed to recte factum and, as a quality, vitium. Also, of offences against propriety of speech, e.g., error. Quint., 1, 5, 47): peccatum, delictum (any sin or error; also of faults in language; e.g., Cic., paucis verbis tria magna peccata): vitium (any blemish or imperfection; figuratively, of barbarisms and solecisms, Quint., 1, 5, 5, sequens and the followings). To remove a blunder, mendum tollere (e.g., librariorum menda toilere, Cic.). To correct a blunder, mendum, errorem or peccatum corrigere. In saying idus Martii, you have made a great blunder, idus Martii magnum mendum continent (it should be idus Martiae). To comit the same blunder, idem peccare: one blunder after another, aliud ex alio peccare. To fall into an opposite blunder, in contrarium vitium converti.
Full of blunders, mendosus. Free from blunders, emendatus (freed from fault; of writings): emendate descriptus (copied out accurately; printed accurately).
blunder
stumble, pedem offendere: vestigio falli (slip, make a false step): labi (slip down).
Commit a blunder, aliquid offendere (blunder against anything; not to act as one ought): labi (make a false step): peccare (sin, commit a fault, πταίειν). Vid: “commit a blunder,” under BLUNDER, s.
To blunder out anything, inconsultius evectum projicere aliquid (Liv., 35, 31, middle).
To blunder upon anything, in aliquid casu incurrere (Cic.).

Quick answer

What is the Latin word for blunder?
The usual Latin words for “blunder” are menda, errō, peccō; also dēlinquō, vitium, mendōsus. 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.