That clutters; speaking with hurried and confused utterance. Hence Clutteringly adv.
1624. Bp. Mountagu, Gagg, 48. Masters that goe workmanlike, and not like you, clutteringly to worke.
1748. J. Mason, Elocut., 17. To cure a thick confused cluttering Voice.
a. 1791. Wesley, Wks. (1872), XIII. 519. The speaking in a thick, cluttering manner.