The act of blocking or preventing someone's plans or efforts from working.
From counter- + thwarting (preventing). Thwart comes from Old Norse þvert meaning 'across,' originally referring to placing something across someone's path. Adding counter- emphasizes blocking an obstruction itself.
This word reveals how English speakers layer negatives—if someone thwarts you, you counterthwart them, showing how conflicts can spiral with each side blocking the other's moves.
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