The antonyms for the phrase "more solid-gold" can include terms like cheap, flimsy, fake, mediocre, and unreliable. While solid-gold refers to something that is durable, valuable, and of high quality, its opposite suggests the opposite qualities. A cheap item, for instance, means that it is not expensive, but it can also imply that it lacks quality and may not last long. Flimsy, on the other hand, means that it is likely to bend or break easily. Hence, while "more solid-gold" implies a stronger and valuable item, the antonyms suggest the opposite: weaker and less valuable.