The phrase "about the solidity of" is correct and usable in written English.
It can be used when discussing the strength, stability, or reliability of a particular subject or concept.
Example: "The report focuses on the solidity of the proposed infrastructure plans and their potential impact on the community."
Alternatives: "regarding the strength of" or "concerning the stability of".
"It makes me worry a bit about the solidity of what up to now looked like a very solid recovery," said Alan Blinder, a Princeton economist who is a former vice chairman of the Federal Reserve and now advises the Kerry campaign on economic matters.
There are doubts about the solidity of their scrum.
I'm not convinced about the solidity of anything.
Many Broadway producers are skeptical about the solidity of Drabinsky's balance sheet.
Mr. Monti said European institutions must build up sufficient means to dispel any doubts among international investors about the solidity of the single currency.
Combined with the effects of the sovereign debt crisis, it refocuses questions by German experts about the solidity of German banks.
And Mrs. Thompson's appearances came on the heels of the latest revelations regarding another Democratic candidate, Anthony D. Weiner, whose admission that he continued to engage in explicit online exchanges with women after resigning from Congress has raised questions about his treatment of women and the solidity of his marriage.
"Barclays is concerned about the riskiness of their business, the solidity of their capital base, and being in a position to lend as the cycle picks up," he told Forbes.
Compared with the solidity of Vogelsang's pages about Cambridge during the plague years, these passionate exchanges in the present can seem a bit weightless and cloying: " 'No, I won't kiss you,' I said, and kissed you.
What is striking about the current debate about containing Iran is that neither side seems entirely confident in the solidity of its argument.
The solidity of twin stoppers was prioritised.
