Antonyms of adj unintelligible

2 senses of unintelligible

Sense 1
unintelligible (vs. intelligible) -- (poorly articulated or enunciated, or drowned by noise; "unintelligible speech")

intelligible (vs. unintelligible) -- (well articulated or enunciated, and loud enough to be heard distinctly; "intelligible pronunciation")

Sense 2
opaque, unintelligible -- (not clearly understood or expressed)

INDIRECT (VIA incomprehensible) -> comprehensible, comprehendible -- (capable of being comprehended or understood; "an idea comprehensible to the average mind")

Similarity of adj unintelligible

2 senses of unintelligible

Sense 1
unintelligible (vs. intelligible) -- (poorly articulated or enunciated, or drowned by noise; "unintelligible speech")
       => slurred, thick -- (spoken as if with a thick tongue; "the thick speech of a drunkard"; "his words were slurred")
          Also See-> incomprehensible#2, uncomprehensible#1

Sense 2
opaque, unintelligible -- (not clearly understood or expressed)
       => incomprehensible (vs. comprehensible), uncomprehensible -- (difficult to understand; "the most incomprehensible thing about the universe is that it is comprehensible"- A. Einstein)