thwarter

Plural: thwarters

Noun

• One who obstructs or prevents the accomplishment of something.
• someone who systematically obstructs some action that others want to take
• A person or thing that thwarts.
• A disease in sheep, characterised by trembling, or convulsion.

Examples

• She became an expert THWARTER of her opponent’s attempts to open up the board.

Synonyms

obstructer, obstructionist, obstructor, resister