to oppose successfully; prevent from accomplishing a purpose.
to frustrate or baffle (a plan, purpose, etc.).
Archaic.
to cross.
to extend across.
noun
a seat across a boat, especially one used by a rower.
a transverse member spreading the gunwales of a canoe or the like.
adjective
passing or lying crosswise or across; cross; transverse.
perverse; obstinate.
adverse; unfavorable.
preposition, adverb
across; athwart.
Origin of thwart
First recorded in 1200–50; Middle English thwert (adverb), from Old Norse thvert “across,” neuter of thverr “transverse”; cognate with Old English thweorh “crooked, cross,” Gothic thwairhs “cross, angry”
SYNONYMS FOR thwart
1 hinder, obstruct.
SEE SYNONYMS FOR thwart ON THESAURUS.COM
synonym study for thwart
1. Thwart,frustrate,baffle imply preventing one, more or less completely, from accomplishing a purpose. Thwart and frustrate apply to purposes, actions, plans, etc., baffle, to the psychological state of the person thwarted. Thwart suggests stopping one by opposing, blocking, or in some way running counter to one's efforts. Frustrate implies rendering all attempts or efforts useless or ineffectual, so that nothing ever comes of them. Baffle suggests causing defeat by confusing, puzzling, or perplexing, so that a situation seems too hard a problem to understand or solve.