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sober - Serious and thoughtful in mood or behavior, not playful or exaggerated; or not under the influence of alcohol or drugs; clear-minded.
It was a year since he gave up drinking and had decided to remain sober all the time, and it took strength to just walk past the bar.
tinker - To attempt to repair or improve something in a casual way, often to no useful effect
Mitch tried to tinker with his computer before realizing that it was more broken that he had thought, and that he had to bring it to the computer store to have a professional repair it.