forthspeak verb2 •(no longer used) To speak forth; declare; announce.The truth Is not to be forthspoken to the mob, Unless you wish to die for it. — 1841 •(no longer used) To reveal; divulge.All I ask is, Do the existing applications of matter forthspeak any operation of intelligent power? — 1854 formsforthspoke · forthspoken · forthspeaking · forthspeaks