LATIN DICTIONARYLexicon Latīnum
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“fastness” in Latin

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

fastness
State of being fast, by circumlocution.
Firm attachment (obsolete), Vid:
Strong-hold, locus natura or naturaliter, munitus; castellum natura munitum. Vid: FORTRESS.

Quick answer

What is the Latin word for fastness?
The usual Latin words for “fastness” are nātūrālis, mūniō. 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.