The Vietnamese word "lạt" has a couple of meanings and uses, so let's break it down for you.
Noun: "Lạt" refers to a bamboo string. Bamboo strings are often used in various traditional crafts and for tying things together in Vietnamese culture.
Adjective: "Lạt" can also mean insipid, flat, or not salted. It describes food or flavors that lack taste or seasoning.
In a more figurative sense, "lạt" can be used to describe something that feels dull or lacks excitement, similar to how we use "bland" in English. - Example: "Bộ phim này thật sự lạt, không có tình tiết gì hấp dẫn." (This movie is really bland; there are no exciting plot twists.)
For the meaning of insipid/flat/not salted, some synonyms include:
For the noun meaning related to bamboo string, there aren't many direct synonyms in Vietnamese, as "lạt" specifically refers to this type of material.