solid, sound, reliable, solid (not liquid)
Os planetas são corpos sólidos?
Are planets solid bodies?
Tente não comer alimentos sólidos ou até, passe o dia em jejum.
Try not to eat solid foods, or even go the whole day without eating.
— Grave (2017)
Ambos são bons com microfones e têm informantes sólidos.
Both are good with microphones and have solid informants.
— O Gângster (2007)
Nossa hipótese se baseia em experimentos sólidos.
Our hypothesis is based on solid experiments.