We found one dictionary that defines the word schoolmasterishly:

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1. schoolmasterishly: Wiktionary

Definitions from Wiktionary (schoolmasterishly) ▸ adverb:  In a schoolmasterish manner. ▸ Words similar to schoolmasterishly ▸ Usage examples for schoolmasterishly ▸ Idioms related to schoolmasterishly ▸ Wikipedia articles (New!) ▸ Words that often appear near schoolmasterishly ▸ Rhymes of schoolmasterishly ▸ Invented words related to schoolmasterishly