adverb
grumbling; muttering complaints
Describes the act of complaining or muttering discontentedly, often under one's breath. Frequently used with verbs like 言う or つぶやく.
彼はいつもぶつくさ文句を言っている。
He's always grumbling complaints.
ぶつくさ言わずにさっさとやりなさい。
Stop muttering complaints and just get it done.