Adjoined is a verb that refers to joining or attaching something to another. There are several synonyms for the word 'adjoined,' including 'connected, attached, bounded, linked, joined, annexed, affixed, conjoined, and merged.' The word 'connected' implies a relationship between two or more things, whereas 'attached' suggests that one thing is affixed to another. 'Bounded' refers to the outer limits of something, and 'linked' indicates a physical or metaphysical connection. 'Annexed' and 'affixed' both suggest something added to a larger piece, while 'conjoined' implies things joined together as one. Finally, 'merged' suggests things combined to the point where they become indistinguishable.