guzu-guzu（グズグズ）
1. Slow, hesitant behavior
muka-muka（ムカムカ）
muka-muka describes a feeling of disgust, irritation, or emotional nausea, often directed toward something unpleasant, offensive, or frustrating.
gaku（ガク）
gaku describes a sudden emotional or physical collapse caused by shock, disappointment, or discouragement.
zun（ズン）
zun describes a deep, heavy, and impactful sound or sensation, often associated with something large or weighty moving, landing, or resonating.