IPA: /ɪnˈɛkspɪlɪt/
KK: /ɪnˈɛkspəlɪt/
Not clearly expressed or defined; vague or ambiguous.
The instructions were inexplicit, leaving many students confused about what to do.
Inexplicit is formed from "in-" (meaning not) and "explicitus" (from Latin, meaning unfolded or clear). The word means not clearly expressed or not fully unfolded in meaning.
Think of 'not' ('in-') being added to 'clear' ('explicitus') — this helps you remember that 'inexplicit' means something that is not clearly expressed.