When combined, 不满 (bùmǎn) literally means “not full.” This is a powerful and intuitive metaphor. Imagine your expectations are a cup. If a service or situation fills that cup, you are 满意 (mǎnyì)—satisfied. If it doesn't, you are left with a feeling of being “not full”—不满 (bùmǎn).
不满 is a versatile term used in various contexts, from formal complaints to personal disagreements.