Synonym: balk, defeat, deter, foil, forbid, frustrate, hamper, hinder, impede, inhibit, obstruct, oppose, prevent, prohibit, ruin, spoil. Similar words: stalwart, highway, northwest, southwest, worthwhile, war, warn, aware. Meaning: [θwɔrt /θwɔːt] 
n. a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat. v. hinder or prevent (the efforts, plans, or desires) of.
n. a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat. v. hinder or prevent (the efforts, plans, or desires) of. 
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1) We must thwart his malevolent schemes.
2) The accounting firm deliberately destroyed documents to thwart government investigators.
3) Harry knew now that nothing could thwart his plans.
4) Congressional Republicans have made clear their intention to thwart these efforts.
5) Though conservatives were still attempting to thwart change, he said,(http://sentencedict.com/thwart.html) central planning and other outmoded Marxist practices had been scrapped.
6) The move was conceivably intended to thwart peace negotiations conducted by the archbishop of Canterbury.
7) Our course must thwart those designs.
8) I don't think that will thwart our purposes.
9) They thwart dastardly supervillains and have saved the world countless times over but macho superheroes now face a determined new foe in the guise of a mild-mannered child psychologist.
10) Paper and blister secure costly tube To thwart shoplifting of a small but expensive tube of over-the-counter medicine, a pharmaceutical company has turned to a paper-and-blister combination package.
11) But is their increasingly fervent devotion enough to thwart the spread of a sparer and more businesslike style of punctuation, from which apostrophes will be omitted?
12) God knew that he had never wished to thwart her in anything!
13) He accused Kremlin hawks of a conspiracy to keep the war going to bolster their own power and thwart his ambitions.
14) Just as urgently, the Putin government is trying to thwart him.
15) It would have to reach 448. 95 or less to thwart the Lockheed Martin-Loral combination.
16) For all these years we had this huge military alliance designed to thwart the dreaded Commies.
17) Providing the military or the wild west sea don't thwart your plans, I doubt very much these climbs will disappoint.
18) However, the council of ministers, divided on every other issue, combined to thwart her.
19) During Yeltsin's campaign for the presidency Gorbachev had at times quite blatantly attempted to thwart him.
20) Ransome Kuti had accused it of instigating the violence in order to thwart the handover to civilian rule scheduled for January 1993.
21) Moreover, it alerts us to the fact that short-sighted tactics may thwart the overall strategy.
22) To some extent his interest in revenge had helped to thwart success over taxation.
23) Shrinking grazing areas and a lack of investment in fodder trees may thwart a sustainable revival.
24) A presumptuous nickname, whether applied directly to a person or one's profession, can thwart communication by its offensiveness as much as by its ambiguity.
25) I can remember the tail slapping and banging and the thwart and the noise the clubbing.
26) The principal must not interfere with the consummation of the agency or thwart the effectiveness thereof.
27) He made the fish fast to bow and stern and to the middle thwart.
28) Parameterized stored procedures that validate all user input can be used to thwart SQL injection attacks.
29) The sophisticated ballistic missile defence system is built to thwart any incoming missile from entering the air space of the country.
30) Raytheon Co. and its team of contractors will work with the Defense Information Systems Agency to thwart potential attacks on Defense Department cyber networks.