from Latin tardus slow + loquentem, pr. pple. of loqui to speak
1656 - Glossographia, Thomas Blount;
"Tardiloquent, that speaks slowly, or draws his speech out at length"
From: The Japan Weekly Mail
Incorporated with the Japan Times
A Weekly Review of Japanese Commerce, Politics, Literature, and Art.
Volume III. No. 21, Yokohama, May 24, 1879