1. not fastened or secured with a strap

1. past tense and past participle of unstrap: removed or unfastened a strap from something

Examples

• The unstrapped backpack fell off his shoulders.
• She left her sandals unstrapped and loose.
• He unstrapped his watch before going to bed.
• The luggage remained unstrapped on the roof rack.
• The child unstrapped herself from the car seat.
• The unstrapped helmet offered no protection.
• They unstrapped the kayak from the car roof.