9 letters · 12 points in Scrabble
verb hinder or prevent (the efforts, plans, or desires) of
verb treat cruelly
originFrom Middle English frustrat (“prevented, disappointed, rendered useless”, adjective as well as past participle of frustraten (see Etymology 1)), from Latin frūstrātus, perfect passive participle of frūstrō (“to deceive”), see -ate (adjective-forming suffix).
Etymology from Wiktionary, CC BY-SA 3.0