безмятежный
imperturbatus [a, um];
лесной
silvaticus [a, um];
непривычный
insolitus [a, um];
accentus [us, m]; vocis sonus [i, m]; tenor [oris, m]; vox [vocis, f] (rustica); tonus, i,m; pronuntiatio [onis, f] extranea/insolita, peregrina insolentia [ae, f];