immutesco
Could not find immutescamus in Logeion dictionaries.
immutescamus Verb: present active subjunctive 1st plural of immutesco
immūtesco (inm-), tŭi, 3, v. inch. n. [in-mutesco],
- to become dumb or speechless (post-Aug.): immutescamus alioqui, si nihil dicendum videatur, Quint. 10, 3, 16: ruptis ore querelis, Stat. Th. 5, 542.
im-mūtēsco, mūtuī, ere (in u. mutesco), verstummen, Quint. 10, 3, 16. Stat. Theb. 5, 542.
immūtēscō, tŭī, ĕre, intr., se taire, demeurer muet : Quint. 10, 3, 16 ; Stat. Th. 5, 542.