Wiktionary
serious-minded
a. solemn
Usage examples of "serious-minded".
More serious-minded revelers (and the maudlin drunks) gathered about a crookbacked goblin bard who had reached the one-hundred-sixty-fifth verse of a lugubrious ballad of doomed Firvulag lovers.
She had been a serious-minded teenager, already hooked on current events, worried about World War III because they told her she was likely to die in a nuclear holocaust before she graduated from high school.
My kind of people, that is, Mama Jibia's kind of people, the non-Fastigat professional class, consider Fastigat men unsuitable for women who are serious-minded.
One of the girls was a sexpot, the other was more serious-minded and could discuss art, literature, and philosophy, not to mention theology.