The Vocalibrate dictionary

pedantic

US/pəˈdæntɪk/GB/pɪˈdæntɪk/adjective

too concerned with small details and rules

Correcting a child's grammar at a birthday party is a little pedantic.

Near in meaning: nitpickingfussyhair-splittingnit-picky
In the family: pedantpedantry

More words worth knowing

perniciousharmful in a slow or hidden way superciliouscoldly haughty, as if everyone else were beneath you tawdryshowy but cheap and of poor quality quotidianordinary and part of everyday life drollamusing in a dry, odd, or understated way indigentvery poor