Below are possible answers for the crossword clue Frustrate, obstruct.
6 letter answer(s) to frustrate, obstruct
THWART
a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat
hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent"
Prevent from succeeding
Other crossword clues with similar answers to 'Frustrate, obstruct'