IPA: /vɪˈbreɪtəˌlɛs/
KK: /vɪˈbreɪtəˌlɛs/
Describing a sound or musical performance that lacks vibrato, which is a slight, rapid variation in pitch.
The singer performed the piece vibratoless, showcasing her pure vocal tone.
Vibratoless → It is formed from "vibrato" (from Italian *vibrato*, meaning vibrating or quivering) and "-less" (meaning without). The word "vibratoless" means without vibration or quivering.
Think of 'vibrato' which means to vibrate, and remember that 'vibratoless' means without any vibration.