Definition of "Sober" :

verb: become sober after excessive alcohol consumption

"Keep him in bed until he sobers up."

verb: become more realistic

"After thinking about the potential consequences of his plan, he sobered up."

verb: cause to become sober

"A sobering thought."

adjective: lacking brightness or color; dull

"Sober Puritan grey."

adjective: not affected by a chemical substance (especially alcohol)

adjective: dignified and somber in manner or character and committed to keeping promises

"As sober as a judge."

adjective: completely lacking in playfulness