Frightened, startled, or aroused to sudden fear or concern; caused alarm or distress.
From 'alarum,' an archaic spelling of 'alarm,' plus '-ed' past participle suffix. 'Alarum' was the common early modern English spelling, popularized in Shakespeare's time.
Shakespeare used 'alarumed' constantly—it's wonderfully dramatic and archaic! The older spelling 'alarum' actually came from Italian 'all'arme' (to arms), showing how military terms shaped English.
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