to murmur is a form of:

Unmannerly



adjective
1.
(not mannerly, impolite, discourteous, coarse. with ill manners) ដែលមានកិរិយាមាយាទ អាក្រក់
ENGLISH MEANING
adjective
1.
Not mannerly; ill-bred; rude.
1.
Uncivilly, rudely