The Vietnamese word "lừ khừ" is an adjective that describes a feeling of being a bit unwell, sluggish, or out of sorts. It can refer to someone feeling tired or lacking energy, similar to how one might feel when they are coming down with a cold or flu.
While "lừ khừ" primarily refers to a feeling of being unwell or sluggish, it can also imply a lack of enthusiasm or a slow response in a more casual, playful context.