disconcert

v. t. [ imp. & p. p. Disconcerted; p. pr. & vb. n. Disconcerting. ] [ Pref. dis- + concert: cf. OF. desconcerter, F. déconcerter. ] 1. To break up the harmonious progress of; to throw into disorder or confusion; as, the emperor disconcerted the plans of his enemy. [ 1913 Webster ]

2. To confuse the faculties of; to disturb the composure of; to discompose; to abash. [ 1913 Webster ]

The embrace disconcerted the daughter-in-law somewhat, as the caresses of old gentlemen unshorn and perfumed with tobacco might well do. Thackeray.

Syn. -- To discompose; derange; ruffle; confuse; disturb; defeat; frustrate. [ 1913 Webster ]

n. Want of concert; disagreement. Sir W. Temple. [ 1913 Webster ]

adj. hard to deal with; causing uncertainty or confusion about how to act or react.
Syn. -- awkward, embarrassing, off-putting, sticky, tight, unenviable. [ WordNet 1.5 ]