defraudarían
-they would disappoint
The word defraudarían is the conditional form of defraudar in the third person plural.
See the full defraudar conjugation

defraudar

Sabía que no me defraudarían.
I knew you boys wouldn't let me down.
Sabía muy bien que esos hombres no me defraudarían.
Frequently I think about the men.
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