LATIN DICTIONARYLexicon Latīnum
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“harmonious” in Latin

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

harmonious
concinens: concors: congruens. (The words are found in this connection and order.) concors et congruens: consonus (harmonizing, being in harmony; opposed to absonus, absurdus): modulatus (scientifically divided, modulated; e.g., tone, song, a speech, etc.).
Symmetrical, Vid: HARMONIOUSLY, concorditer: congruenter: modulate.

Quick answer

What is the Latin word for harmonious?
The usual Latin words for “harmonious” are concinō, concors, congruō; also cōnsonus, modulor, absurdus. 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.