Possible Definitions:
1. Thwart (a.) Situated or placed across something else; transverse; oblique.
2. Thwart (a.) Fig.: Perverse; crossgrained.
3. Thwart (a.) Thwartly; obliquely; transversely; athwart.
4. Thwart (prep.) Across; athwart.
5. Thwart (n.) A seat in an open boat reaching from one side to the other, or athwart the boat.
6. Thwart (v. t.) To move across or counter to; to cross; as, an arrow thwarts the air.
7. Thwart (v. t.) To cross, as a purpose; to oppose; to run counter to; to contravene; hence, to frustrate or defeat.
8. Thwart (v. i.) To move or go in an oblique or crosswise manner.
9. Thwart (v. i.) Hence, to be in opposition; to clash.