testily

adjective, tes·ti·er, tes·ti·est.

1. irritably impatient; touchy.

adjective -tier or -tiest

1. irritable or touchy

adj.c.1500, “impetuous, rash,” from Middle English testif “headstrong” (late 14c.), from Anglo-French testif, Old French testu “stubborn,” literally “heady,” from teste “head,” from Late Latin testa “skull,” in classical Latin “pot, shell” (see tester (n.2)). Meaning “easily irritated” is first recorded 1520s.