Characterized by droning; monotonous and dull like the sound of a drone; producing a continuous humming noise.
From 'drone' with the common adjectival suffix '-y,' which means 'having the quality of' or 'resembling.' This is a standard English word-formation pattern.
A 'drony' voice isn't necessarily bad—think of beautiful ambient music that uses droning synthesizers, or the hypnotic quality of bagpipes—sometimes that monotonous hum is exactly what makes something beautiful!
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