open
9 synonyms and 7 antonyms for open, grouped by meaning and by how common each one is.
Adjective — Not closed, blocked, or sealed — allowing entry, passage, or view.
Synonyms
Everyday swaps
Common words most readers know — safe in any writing.
Less common
Still standard English, but they carry more weight.
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
Antonyms
How to use open
The word patterns that sound natural to a native speaker.
Etymology
From Old English open, going back to a very old Germanic root meaning "up from under" — related to the English word "up."
Full origin of open →Frequently asked questions
What does “open” mean?
The word “open” means not closed, blocked, or sealed — allowing entry, passage, or view. In plain terms, not shut — able to let things or people through, or, for a person, willing to share and communicate freely.
How do you pronounce “open”?
“Open” is pronounced OH-puhn (/ˈoʊ.pən/ in IPA).
How do you use “open” in a sentence?
Here is “open” used in a sentence: “She left the window open to let in some air.”
What is another word for “open”?
Words with a similar meaning to “open” include accessible, unimpeded and unseal.
What is the opposite of “open”?
The opposite of “open” — its antonyms — are closed, shut, without prejudice, checked and closed-source.
What part of speech is “open”?
Depending on how it is used, “open” can be an adjective, a verb and a noun.
Where does the word “open” come from?
The word “open” comes from Old English. From Old English open, going back to a very old Germanic root meaning "up from under" — related to the English word "up.".
Is “open” a common word?
“Open” is a very common word in modern English, usually learned at around the A1 level.
What is the opposite of open?
The most common opposite is 'closed' or 'shut.' Depending on context, 'sealed,' 'blocked,' or 'locked' also contrast with open. Where open allows entry, passage, or view, these words describe something stopped or fastened — a shut door, a sealed envelope, or a blocked road.
What is the difference between open and ajar?
'Ajar' means slightly or partly open, and is used almost only of doors and windows — 'the door was ajar.' 'Open' is broader: it can mean fully open or simply not closed, and applies to almost anything, from a box to a road to a shop.
What are the different meanings of open?
As an adjective, 'open' can describe something physically not closed (an open window), a business ready to serve customers (open till nine), something available or unrestricted (open to everyone), or a person who is frank and receptive (open-minded). Context decides which sense applies.