sober vs stone-sober

sober and stone-sober both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sober	No	Yes	Yes	No
stone-sober	No	Yes	No	No

sober (adjective)	stone-sober (adjective)
not affected by a chemical substance (especially alcohol)	totally sober
completely lacking in playfulness
lacking brightness or color; dull
dignified and somber in manner or character and committed to keeping promises

sober (verb)	stone-sober (verb)
become sober after excessive alcohol consumption
become more realistic
cause to become sober