unmodulated

Definitions of unmodulated
1

adj characterized by lack of variation in pitch, tone, or volume

“he lectured in an unmodulated voice edged with hysteria”
Synonyms:
flat, monotone, monotonic, monotonous
sounded or spoken in a tone unvarying in pitch
Antonyms:
modulated
changed or adjusted in pitch, tone, or volume
softened
toned down
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