Wikipedia
A monosyllabic language is a language in which words predominantly consist of a single syllable. The languages of China and Southeast Asia are sometimes referred to as monosyllabic languages. The languages of the region tend to be highly isolating and can be phonetically complex (the phonetic rules of Thai language permits 23 638 possible syllables, compared to, for example, Hawaiian language's 162). The difficulty of defining the term "word," such as the difficulty of telling apart collocations, set phrases and compound words in languages such as Chinese or English (is "dog house/doghouse" a single word or a two-word phrase?), the subjective question of what constitutes "most" words to make a language monosyllabic (there are no living languages that are strictly monosyllabic) and other such considerations render the topic non-scientific and unencyclopedic.
A monosyllable may be complex and include seven or more consonants and a vowel (CCCCVCCC or CCCVCCCC as in English "strengths") or be as simple as a single vowel or a syllabic consonant.
Few known recorded languages preserve simple CV forms which apparently are fully functional roots conveying meaning, i.e. are words ---- but are not the reductions from earlier complex forms that we find in Mandarin Chinese CV forms, almost always derived with tonal and phonological modifications from Sino-Tibetan *(C)CV(C)(C)/(V) forms.
Examples of monosyllabic languages include Vietnamese and Old Chinese. However, all known varieties of modern Chinese are not monosyllabic; see Chinese morphology and Vietnamese morphology for discussion.
Usage examples of "monosyllabic language".
He began talking to himself in a nasal, monosyllabic language I did not understand.
Occasionally they would exchange words with one another in a monosyllabic language.
She gestured her soldiers back, took the camera from the Ovion who held it, and in the soft, monosyllabic language of her race ordered them away from the spying post.