The Vietnamese word "oi nồng" is an adjective that describes a hot and humid atmosphere, often associated with sultry weather. It conveys a sense of discomfort due to heat and moisture in the air, making it feel oppressive or stifling.
While "oi nồng" primarily refers to sultry weather, it can also imply a sense of heaviness in the air or a feeling of being overwhelmed, whether due to the weather or other intense situations.