What is the Latin word for fathomless?

The usual Latin words for “fathomless” are immēnsus, inexplicābilis. The right choice depends on the sense; see the distinctions below.

English → Latin

“fathomless” in Latin

immēnsusimmeasurable, boundless, endless, vast, immense inexplicābilisinexplicable

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

fathomless

fundo carens (bottomless; of a river, Plin., 3, 16, 20): immensa or infinita altitudine: immensus (that cannot be measured): inexplicabilis (that cannot be explained from its depth): the fathomless depth of the sea, infinita maris altitudo.

Quick answer

What is the Latin word for fathomless?: The usual Latin words for “fathomless” are immēnsus, inexplicābilis. 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.