WordNet: unmodulated

characterized by lack of variation in pitch, tone, or volume; "he lectured in an unmodulated voice edged with hysteria"

• similar to flat, monotone, monotonic, monotonous

unmodulated

• (englanti) modulated (antonym)
• (suomi) tasainen (synonyymi)

• (suomi) yksitoikkoinen (synonyymi)