IPA: /ˌɪn.ɑːrˈtɪk.jʊ.lət/
KK: /ɪnˈɑrtɪkjʊlɪt/
Not able to express thoughts or feelings clearly in speech; often speechless or unclear in communication.
After hearing the shocking news, he was inarticulate and could barely respond.
A type of brachiopod that does not have a hinge connecting its two shell parts.
The inarticulate species are fascinating because they lack the typical hinge found in other brachiopods.
Inarticulate → It is formed from "in-" (meaning not) and "articulatus" (from Latin, meaning jointed or clearly expressed). The word "inarticulate" means not able to express oneself clearly or not jointed in speech.
Think of 'not' ('in-') being able to express clearly ('articulatus') — that's why inarticulate means unable to speak clearly.