ABB-pattern adjective formed by reduplicating
悠 yōu ('long, leisurely') after
慢 màn ('slow'). The reduplication softens the meaning into something vivid and almost picturesque — closer to English 'taking it easy' than 'lazy'. Often used adverbially with
地 (
慢悠悠地走). Tone can be neutral (rural, peaceful) or mildly impatient (someone dawdling).