Answer:

thwarts

Answer	Crossword Clue
THWARTS	Stymies
THWARTS	Obstructs
THWARTS	Ruins the plans of

THWARTS	Short-circuits
THWARTS	Frustrates.
THWARTS	Foils
THWARTS	Frustrates

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.