tiha voda brijege dere, тиха вода брег рони angolul

still waters run deep▼(a person's calm appearance may be misleading)
phrase
[UK: stɪl ˈwɔː.təz rʌn diːp] [US: ˈstɪl ˈwɒ.tərz ˈrən ˈdiːp]