sacred vs unspeakable

sacred and unspeakable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sacred	No	Yes	No	No
unspeakable	No	Yes	No	No

sacred (adjective)	unspeakable (adjective)
concerned with religion or religious purposes	exceptionally bad or displeasing
(often followed by `to') devoted exclusively to a single use or purpose or person	defying expression or description
made or declared or believed to be holy; devoted to a deity or some religious ceremony or use	too sacred to be uttered
worthy of respect or dedication
worthy of religious veneration