ぶっきらぼうに言う
to speak in a rough, low voice
無愛想で低い声で話す
ぶっきらぼうに返事する
to answer in a rough and unfriendly manner
無愛想で不親切な態度で返事する
ぶっきらぼうに呟く
to speak in a low, indistinct, and bad-tempered voice
低く、荒々しく、不親切な声で話す