Possible Results:
hubiera subestimado
-I had underestimated
Past perfect subjunctiveyoconjugation ofsubestimar.
hubiera subestimado
-he/she/you had underestimated
Past perfect subjunctiveél/ella/ustedconjugation ofsubestimar.

subestimar

Y podría haber tenido éxito, si no hubiera subestimado tu orgullo y arrogancia.
And I might have succeeded, if I hadn't underestimated your pride and arrogance.
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