| OP | openly straightforward and direct without reserve or secretiveness |
|---|---|
| OP | lax in enforcing laws |
| OP | without undue constriction as from e.g. tenseness or inhibition |
| OP | affording free passage or view |
| OP | affording unobstructed entrance and exit |
| OP | affording free passage or access |
| OP | used of mouth or eyes |
| OP | having no protecting cover or enclosure |
| OP | (music) used of string or hole or pipe of instruments |
| OP | (mathematics) of a set |
| OP | open and observable |
| OP | open to or in view of all |