טִימְטֵם (Pilp. of טָמַם) 1) to knead into a cohesive shapeless mass, contrad. to גלגל to roll and shape the dough. Ḥall. III, 1 טִימְטְמָהּ בשעורים after one has formed a lump of barley flour; Tosef. ib. I, 11; a. e. —2) to thicken, obstruct, esp. to blunt the understanding. Pes. 42ᵃ מְטַמְטֵם את הלב obstructs the heart (makes a person dull). Yoma 39ᵃ עבירה מְטַמְטֶמֶת … ונְטַמֹּתֶם Ms. (ed. ונטמטם, corr. acc.) sin dulls the heart of man, read not (Lev. XI, 43) v’nitmethem (you will be defiled) but un’tammothem (from טָמַם) (you will become dull-hearted); Yalk. Lev. 545.—Ch. טַמְטֵם.
Hithpalp. - הִיטַּמְטֵם to become a shapeless mass. Ḥall. l. c. ותִטַּמְטֵם; Tosef. ib. l. c. יתִיטַּמְטֵים.