so·ber
[soh-ber]
adjective, -er, -est, verb
–adjective
1.not intoxicated or drunk.
2.habitually temperate, especially in the use of liquor.
3.quiet or sedate in demeanor, as persons.
4.marked by seriousness, gravity, solemnity, etc., as of demeanor, speech, etc.: a sober occasion.
5.subdued in tone, as color; not gay or showy, as clothes.
6.free from excess, extravagance, or exaggeration: sober facts.
7.showing self-control: sober restraint.
8.sane or rational: a sober solution to the problem.
–verb (used with object), verb (used without object)
9.to make or become sober: (often followed by up).