Does solid mean good?

Excuse me, but could you clarify something for me? I've been hearing the term 'solid' used quite frequently in the context of investments and cryptocurrencies, and I'm wondering if it's always synonymous with 'good.' For instance, if someone describes a particular coin or asset as 'solid,' does that automatically mean it's a SAFE and profitable investment? Or could there be other factors at play that might make it less than ideal? I'd appreciate your insight on this matter.