Ante la incertidumbre del futuro, dudaba de la viabilidad de mis planes.
In the face of the uncertainty of the future, I doubted the viability of my plans.
Context: philosophical reflection Dudaba de la sinceridad de sus palabras, pues sus acciones contradicen sus promesas.
I doubted the sincerity of his words, as his actions contradict his promises.
Context: interpersonal relationships La duda que experimentaba era más que simple inseguridad; era una crisis existencial.
The doubt I experienced was more than simple insecurity; it was an existential crisis.
Context: psychology