蓬鬆異用字膨鬆、唪鬆phōng-song性質、程度形容詞形容物體結構鬆散、不夠密實。曝焦的紫菜蓬鬆無重。Pha̍k-ta ê tsí-tshài phōng-song bô tāng.曬乾的紫菜鬆散沒重量。類義冇心phànn-sim