Нареч. к гнусавый.
{Наумка Архипов} говорит гнусаво и тягуче, точно норовит заплакать. Гладков, Повесть о детстве.
гнуса́во
Соотносится по знач. с прил.: гнусавый.
гнусливо
"The present time has one advantage over every other - it is our own." Charles Caleb Colton
"If you can't feed a hundred people, then feed just one." Mother Teresa
"The most effective way to do it, is to do it." Amelia Earhart
"They always say time changes things, but you actually have to change them yourself." Andy Warhol