intelligible vs understandable

intelligible and understandable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
intelligible	No	Yes	No	No
understandable	No	Yes	No	No

As adjectives, intelligible and understandable are synonyms defined as:

intelligible and understandable: capable of being apprehended or understood

Other synonyms of intelligible include apprehensible, graspable, perceivable.

intelligible (adjective)	understandable (adjective)
well articulated or enunciated, and loud enough to be heard distinctly	capable of being apprehended or understood
capable of being apprehended or understood