This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To prevent the occurrence, realization, or attainment of: They thwarted her plans.

v. To oppose and defeat the efforts, plans, or ambitions of.

n. Nautical A seat across a boat on which a rower may sit.

adj. Extending, lying, or passing across; transverse.

adj. Eager to oppose, especially wrongly; perverse.

ad. Archaic Athwart; across.

v. to prevent; to halt; to cause to fail; to foil; to frustrate.

n. A brace, perpendicular to the keel, that helps maintain the beam (breadth) of a marine vessel against external water pressure and that may serve to support the rail.

n. A seat across a boat on which a rower may sit.

adj. Situated or placed across something else; transverse; oblique.

adj. Fig.: Perverse; crossgrained.

ad. Thwartly; obliquely; transversely; athwart.

preposition. Across; athwart.

n. A seat in an open boat reaching from one side to the other, or athwart the boat.

v. To move across or counter to; to cross.

v. To cross, as a purpose; to oppose; to run counter to; to contravene; hence, to frustrate or defeat.

verb-intransitive. To move or go in an oblique or crosswise manner.

verb-intransitive. Hence, to be in opposition; to clash.

n. See the extract.

From side to side; across; crosswise; transversely; athwart.

Across; athwart.

Opposite to; over against.

Lying or extending across or crosswise; cross; transverse.

Antithetical.

Perverse; contrary; cross-grained.

n. Opposition; defiance.

To pass over or across; cross.

To put crosswise, or one across another.

To put in the way; oppose.

To cross, as a purpose; contravene; frustrate; baffle.

Synonyms Foil, Baffle, etc. See frustrate.

To go crosswise or obliquely.

To be in opposition; be contrary or perverse; hence, to quarrel; contend.

n. A seat across a boat on which the oarsman sits.

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

"Mugabe spoke about a "vicious onslaught" by his overseas critics, saying they were trying to "thwart" the country from importing food."

thwarted    thwarting    thwartness    thwarts   

crosspiece   

after-thwart    bow-thwart   

beam   

athwart    athwartships    thwarter   

transverse    oblique    crossgrained    thwartly    obliquely    transversely    athwart    across    oppose    contravene   

Court    Dort    Mort    Porte    Stuart    abort    assort    athwart    boart    bort   

nine-pounder    knittin    companionway    affordeth    southside    carronade    bosun    gratefull    entrie    fadom