(a musical part for) a person having the highest adult male singing voice or the lowest female singing voice (above tenor)

low

a man with a voice between tenor and a bass

intense in effect on senses

deep-sounding; low in tone

low

(a woman with) the lowest female voice

alto

(of things known by the senses) weak; not clear

having little effect on senses

with little or no sound; free from excitement, trouble, anxiety; gentle

without or with little sound