Verbs

(v)sobercause to become sober“A sobering thought”
(v)sober up, soberbecome more realistic“After thinking about the potential consequences of his plan, he sobered up”
(v)sober up, soberbecome sober after excessive alcohol consumption“Keep him in bed until he sobers up”

Adjectives

(a)sobernot affected by a chemical substance (especially alcohol)
(s)grave, sedate, sober, solemndignified and somber in manner or character and committed to keeping promises“a grave God-fearing man”, “a quiet sedate nature”, “as sober as a judge”, “a solemn promise”, “the judge was solemn as he pronounced sentence”
(s)drab, sober, somber, sombrelacking brightness or color; dull“drab faded curtains”, “sober Puritan grey”, “children in somber brown clothes”
(a)unplayful, serious, sobercompletely lacking in playfulness