Webster's Revised Unabridged Dictionary · 1913

Thwart

Thwart , adjective

[Old English þwart, þwert, a. and adv., Icelandic þvert, neut. of þverr athwart, transverse, across; akin to Anglo-Saxon þweorh perverse, transverse, cross, Dutch dwars, Old High German dwerah, twerh, German zwerch, quer, Danish & Swedish tver athwart, transverse, Swedish tvar cross, unfriendly, Gothic þwaírhs angry. Compare Queer.]

1.
Situated or placed across something else; transverse; oblique.
Moved contrary with thwart obliquities. — Milton
2.
Figuratively: Perverse; crossgrained. [Obsolete] — Shakespeare

Thwart , adverb

[See Thwart, a.]

Thwartly; obliquely; transversely; athwart. [Obsolete] — Milton

Thwart , preposition

Across; athwart. — Spenser
Collocations (1)
Thwart ships , See Athwart ships, under Athwart.

Thwart , noun

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

Thwart , transitive verb

1.
To move across or counter to; to cross; as, an arrow thwarts the air. [Obsolete]
Swift as a shooting star In autumn thwarts the night. — Milton
2.
To cross, as a purpose; to oppose; to run counter to; to contravene; hence, to frustrate or defeat.
If crooked fortune had not thwarted me. — Shakespeare
The proposals of the one never thwarted the inclinations of the other. — South

Thwart , intransitive verb

1.
To move or go in an oblique or crosswise manner. [Rare]
2.
Hence, to be in opposition; to clash. [Rare]
Any proposition... that shall at all thwart with internal oracles. — Locke