Backpage.com has stringent safeguards in place to ensure that only adults use the site.
Armstrong and others have made the point that pro cycling has the most stringent drug testing of any professional sport.
Yet we do have stringent regulations regarding adoption in this country.
c.1600, "astringent," especially with reference to taste, from Latin stringentem (nominative stringens), present participle of stringere "to compress, contract, bind or draw tight" (see strain). Of regulations, procedures, etc., 1846.