Disconcert

Part of speech: noun (n.)

Want of concert; disagreement. Sir W. Temple.

Part of speech: verb (v.)

1. To break up the harmonious progress of; to throw into disorder or confusion; as, the emperor disconcerted the plans of his enemy.

2. To confuse the faculties of; to disturb the composure of; to discompose; to abash. The embrace disconcerted the daughter-in-law somewhat, as the caresses of old gentlemen unshorn and perfumed with tobacco might well do. Thackeray.

Synonyms: discompose; derange; ruffle; confuse; disturb; defeat; frustrate.