frustrar
to frustrate
verb froos-TRAHR Rare
Origin: From Latin frustrare, from frustra (in vain).
Also means
to thwart
Usage Note
Frustrar means both to frustrate someone emotionally and to thwart or foil a plan (frustrar un ataque — to thwart an attack). The reflexive frustrarse means to feel frustrated. Note that frustrado can mean either 'frustrated' (emotional state) or 'failed/foiled' (un intento frustrado — a failed attempt), so context matters.
Examples
"La lluvia frustró los planes del fin de semana."
Natural Translation
The rain frustrated the weekend plans.

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