From Longman Dictionary of Contemporary Englishbe loud in your praise/opposition/support etcbe loud in your praise/opposition/support etcSTRONG FEELING OR BELIEFto express your approval or disapproval very strongly The local business community was loud in its support for the scheme. → loud
Examples from the Corpus
be loud in your praise/opposition/support etc• Nevertheless, both my master and Agrippa were loud in their praise of my martial prowess. 