What does unbolted mean?
Unbolted means not fastened with a bolt, and therefore loose, unsecured, or open. The word commonly describes doors, gates, machinery, floor plates, and other objects that should have been secured but have not been. It can also carry a figurative implication: an unbolted entrance may suggest carelessness, vulnerability, or deliberate openness, while an unbolted restriction implies that a protective barrier has been removed. As the past tense and past participle of unbolt, it describes the action of releasing or removing a fastening bolt. The form is used in both British and American English and is understood even where mechanical fastenings are not common, because it clearly conveys the contrast between being secured and being left open. Its usefulness lies in this precise association with a bolt, distinguishing it from more general terms such as open or loose.
Not fastened or secured by a bolt; loose, open, or unsecured.
"The inspector discovered that several floor panels were unbolted."
Often used literally, but it can also suggest figurative vulnerability or a removed safeguard.
Past tense and past participle of unbolt: having released or removed a fastening bolt.
"He unbolted the cover before inspecting the machinery."
This form is generally used when the action is completed or has formed a perfect tense.
An unbolted door is secure only by convention—the slightest push may undo the whole arrangement.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unbolted come from?
Unbolted was formed in English by combining the negative prefix un- with bolt. The prefix indicates reversal or removal, while bolt refers to a fastening device; the older English word also had senses connected with arrows and other projectiles. Bolt belongs to a Germanic vocabulary family, with related forms in Dutch and German, while un- reflects the English use of the Latin prefix in-. The negated form developed by applying that reversal to the verb and adjective meanings of bolt.
Related word forms
How unbolted is actually used
The word is neutral in register and is most often used literally for doors, gates, floors, machinery, and other objects secured by bolts. In figurative use, it can suggest that a barrier or safeguard has been removed.