sober vs drug-free

sober and drug-free both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sober	No	Yes	Yes	No
drug-free	No	Yes	No	No

sober (adjective)	drug-free (adjective)
not affected by a chemical substance (especially alcohol)	characteristic of a person not taking illegal drugs or of a place where no illegal drugs are used
completely lacking in playfulness
lacking brightness or color; dull
dignified and somber in manner or character and committed to keeping promises

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