The Vietnamese word "nhạt nhẽo" can be translated to English as "tasteless" or "insipid." It is used to describe something that lacks flavor, interest, or excitement.
Tasteless: When referring to food or drink, it means that it has no flavor or is very bland.
Insipid: When describing jokes, conversations, or events, it means that they are dull or uninteresting.
In summary, "nhạt nhẽo" is a versatile word that can describe anything from food lacking flavor to a conversation that fails to engage.