fastened
adj. B2 Upper Intermediate US //ˈfæsənd// UK //fˈɑːsənd// fas·tened
adj. closed or joined together firmly. You use this to describe things like seatbelts, buttons, or gates that are locked or tied in place.
adj. firmly closed, attached, or secured in position. Often used predicatively after linking verbs like 'remain' or 'stay'.
Make sure your seatbelt is securely fastened.
The old wooden gate remained fastened with a heavy iron bolt to keep the cattle from wandering.
Despite the turbulence, the cargo stayed fastened to the deck thanks to the reinforced steel cables and industrial-grade tension straps.
Usage
Often follows a linking verb or appears as a participial adjective before a noun.