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1.
So´ber-mind`ed
a. 1. Having a disposition or temper habitually sober.

b. 2. self-controlled

adjective
rational; sensible.
However many sober-minded scientists felt that this criticism was irrelevant.

A person who is studious and logical is an example of someone who would be described as sober-minded.
av Jcatralina 11 juni 2012