ineffable vs indefinable

ineffable and indefinable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ineffable	No	Yes	No	No
indefinable	No	Yes	No	No

As adjectives, ineffable and indefinable are synonyms defined as:

Other synonyms of ineffable include indescribable, unspeakable, untellable, unutterable.

ineffable (adjective)	indefinable (adjective)
defying expression or description	defying expression or description
too sacred to be uttered	not capable of being precisely or readily described; not easily put into words