1. Support that is inadequate, unenthusiastic, or lacking in energy and effectiveness
The project received only lackluster support from management, which hindered its progress.
O projeto recebeu apenas apoio fraco da administração, o que dificultou seu progresso.
2. Assistance or endorsement that is dull, uninspired, or half-hearted
Despite the campaign's importance, it generated lackluster support among voters.
Apesar da importância da campanha, ela gerou apoio fraco entre os eleitores.