| open | (adjective) ready or willing to receive favorably | Synonyms: receptive |
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| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: unfastened |
| (adjective) affording free passage or access | - |
| (adjective) (set theory) of an interval that contains neither of its endpoints | - |
| (adjective) open and observable; not secret or hidden | Synonyms: overt |
| (adjective) used of mouth or eyes | Synonyms: opened |
| (adjective) ready for business | - |
| (adjective) not having been filled | - |
| (adjective) (of textures) full of small openings or gaps | Synonyms: loose |
| (adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: candid, heart-to-heart |
| (adjective) not requiring union membership | - |
| (adjective) open to or in view of all | - |
| (adjective) possibly accepting or permitting | Synonyms: capable, subject |
| (adjective) without undue constriction as from e.g. tenseness or inhibition | - |
| (adjective) having no protecting cover or enclosure | - |
| (adjective) affording free passage or view | Synonyms: clear |
| (adjective) with no protection or shield | Synonyms: exposed |
| (adjective) accessible to all | - |
| (adjective) not sealed or having been unsealed | Synonyms: opened |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: undecided, undetermined, unresolved |
| (adjective) not defended or capable of being defended | Synonyms: assailable, undefendable, undefended |
| opencast | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencut |
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| opencut | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencast |
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| opened | (adjective) used of mouth or eyes | Synonyms: open |
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| (adjective) made open or clear | - |
| (adjective) not sealed or having been unsealed | Synonyms: open |
| openhanded | (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal |
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| openhearted | (adjective) freely communicative; candidly straightforward | - |
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| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic |
| opening | (adjective) first or beginning | - |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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