Wiktionary
schoolmarmish
a. Resembling a schoolmarm.
Usage examples of "schoolmarmish".
It was a schoolmarmish gesture, although there was no small amount of wickedness in the heavy woman’s smirking smile—she might have thought Ruth a lesbian.
I left my hair down until it dried and I could pin it back up into a schoolmarmish bun intended to discourage unwanted attention from good ol' boys named Bubba, Bo, and Jellybelly.
The stranger was a woman about Anna's age but with a stern schoolmarmish look instead of Anna's warmth.