In a way that shows doubt; with uncertainty or lack of conviction.

संदेह के साथ

English Usage: She looked at the proposal doubtfully, unsure if it would succeed.

Hindi Usage: उसने प्रस्ताव को संदेह के साथ देखा, यह सुनिश्चित नहीं था कि क्या यह सफल होगा।