intellect-, intellig-

(Latin: know, learn)

intelligibly
In an intelligible manner or characterized by a well articulated, enunciated, and loud enough to be heard distinctly.
pseudointellectual, pseudo-intellectual
"He was a real pseudo-intellectual."
unintelligible
1. Poorly articulated or enunciated, or drowned out by noise; for example, unintelligible speech.
2. Not clearly understood or expressed.

Inter-related cross references, directly or indirectly, involving word units meaning "know, knowledge; learn, learning": cogni-; discip-; gno-; histor-; learn, know; math-; sap-; sci-; sopho-.