Antonyms of adj sonorous

1 sense of sonorous

Sense 1
heavy, sonorous -- (full and loud and deep; "heavy sounds"; "a herald chosen for his sonorous voice")

INDIRECT (VIA full) -> thin -- ((of sound) lacking resonance or volume; "a thin feeble cry")

Similarity of adj sonorous

1 sense of sonorous

Sense 1
heavy, sonorous -- (full and loud and deep; "heavy sounds"; "a herald chosen for his sonorous voice")
       => full (vs. thin) -- ((of sound) having marked deepness and body; "full tones"; "a full voice")