Meaning of 籠っ声 in Japanese

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Definition of 籠っ声

こえ(koe) 【声 ·聲】

こもる(komoru) 【籠もる ·籠る ·篭る ·隠る】

(v5r, vi) to seclude oneself; to be confined in
to be filled (e.g. with emotion, satire, etc.); to be heavy (with)
彼は私に愛情のこもった手紙をくれた。
He sent me an affectionate letter.
to be stuffy
to be implied