1. assistance or backing that is doubtful, unreliable, or of uncertain validity
The project received only questionable support from the board, leaving its future uncertain.
O projeto recebeu apenas apoio questionável do conselho, deixando seu futuro incerto.
2. endorsement or help that raises doubts about its sincerity or effectiveness
His candidacy enjoyed questionable support from wealthy donors with hidden agendas.
Sua candidatura desfrutou de apoio questionável de doadores ricos com agendas ocultas.