Modifies a noun

• motion: It was a tremulous motion, more than a sudden jar.

• voice: He began the ceremony, and his low, tremulous voice could scarcely be heard through the moaning of the wind amid the tombs.

• hand: And yet they seem alive and quivering Against my tremulous hands which loose the string And let them drop down on my knee to-night.

• tone: Many were visibly affected, and it was in tremulous tones that the congregation entered upon the singing.

• smile: She is blind to Miss Drone's tremulous smile of pretense that she has chosen to be a wallflower.

• vocal: Suddenly rooted to the spot, the music halts to leave Lynch's tremulous vocals trail off uneasily.

Modifying Another Word

• so: I try to be more optimistic, think... " The cassette barely picks up his voice, it is so tremulous and uncaring.

Used with adjective complement

• sound: These bodily changes can also affect the voice, making it sound tremulous, or disjointed by over-rapid breathing.