How to Say "close-knit" in Spanish
The Spanish word for “close-knit” is “unido” — A2 level. This is a very common word in everyday Spanish.

Examples
Los Estados Unidos son un país grande.
The United States is a large country.
Mi familia está muy unida; siempre nos ayudamos.
My family is very close-knit; we always help each other.
Las dos mesas quedaron unidas por un tornillo.
The two tables were joined by a screw.
Adjective Agreement
"Unido" is an adjective, so it must change its ending (gender and number) to match the noun it describes: masculino singular (unido), femenino singular (unida), masculino plural (unidos), femenino plural (unidas).
Origin as a Participle
This word comes directly from the verb 'unir' (to unite or join). When you use 'unido' with 'estar' or 'ser', it describes the result of the action: something that has been joined.
Forgetting Agreement
Mistake: “Las personas está unido.”
Correction: Las personas están unidas. (Since 'personas' is plural and feminine, 'unido' must become 'unidas'.)
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