Wiktionary
a. Resembling or characteristic of a schoolmaster.
Usage examples of "schoolmasterish".
Well, the basic instructions can be told in a schoolmasterish voice, but—when I began to dwell on the numerous stimulating and satisfying things that can be done to a woman's breasts and tipíli and especially the sensitive xacapili, by means of fingers and tongue and lips and even eyelashes—well, I could not help remembering all the nuances and refinements I myself had employed and enjoyed, in times recent and past, and my voice tended to become unsteady.
The Bible contains precisely one joke, and that is a schoolmasterish pun attributed to Christ when he told Peter that he was the rock on which the Church was founded.
When he spoke it was in the schoolmasterish manner that he sometimes affected.