1. [Adjective]: of a set; containing points whose neighborhood consists of other points of the same set, or being the complement of an open set; of an interval; containing neither of its end points

2. [Adjective]: affording unobstructed entrance and exit; not shut or closed; "an open door"; "they left the door open"

3. [Adjective]: used of mouth or eyes; "keep your eyes open"; "his mouth slightly opened"

4. [Adjective]: used of string or hole or pipe of instruments

5. [Adjective]: open and observable; not secret or hidden; "an overt lie"; "overt hostility"; "overt intelligence gathering"

6. [Adjective]: affording free passage or access; "open drains"; "the road is open to traffic"; "open ranks"

7. [Noun]: information that has become public; "all the reports were out in the open"; "the facts had been brought to the surface"

8. [Noun]: where the air is unconfined; "he wanted to get outdoors a little"; "the concert was held in the open air"; "camping in the open"

9. [Noun]: a tournament in which both professionals and amateurs may play

10. [Noun]: a clear or unobstructed space or expanse of land or water; "finally broke out of the forest into the open"

11. having no protecting cover or enclosure; "an open boat"; "an open fire"; "open sports cars"

12. ready for business; "the stores are open"

13. open to or in view of all; "an open protest"; "an open letter to the editor"

14. receptive to new ideas; "an open mind"; "open to new ideas"

15. accessible to all; "open season"; "an open economy"

16. relatively empty of and unobstructed by fences or hedges or headlands or shoals; "in open country"; "the open countryside"; "open waters"; "on the open seas"

17. without any attempt at concealment; completely obvious; "open disregard of the law"; "open family strife"; "open hostility"; "a blatant appeal to vanity"; "a blazing indiscretion"

18. openly straightforward and direct without reserve or secretiveness; "his candid eyes"; "an open and trusting nature"; "a heart-to-heart talk"

19. not brought to a conclusion; subject to further thought; "an open question"; "our position on this bill is still undecided"; "our lawsuit is still undetermined"

20. without undue constriction as from e.g. tenseness or inhibition; "the clarity and resonance of an open tone"; "her natural and open response"

21. possibly accepting or permitting; "a passage capable of misinterpretation"; "open to interpretation"; "an issue open to question"; "the time is fixed by the director and players and therefore subject to much variation"

22. not having been filled; "the job is still open"

23. with no protection or shield; "the exposed northeast frontier"; "open to the weather"; "an open wound"

24. opened out; "an open newspaper"

25. not sealed or having been unsealed; "the letter was already open"; "the opened package lay on the table"

26. sincere and free of reserve in expression; "Please be open with me"

27. not secret; "open plans"; "an open ballot"

28. lax in enforcing laws; "an open town"

29. (of textures) full of small openings or gaps; "an open texture"; "a loose weave"

30. affording free passage or view; "a clear view"; "a clear path to victory"

31. not defended or capable of being defended; "an open city"; "open to attack"

32. [Verb]: start to operate or function or cause to start operating or functioning; "open a business"

33. [Verb]: make available; "This opens up new possibilities"

34. [Verb]: make the opening move; "Kasparov opened with a standard opening"

35. [Verb]: become open; "The door opened"

36. [Verb]: display the contents of a file or start an application as on a computer

37. [Verb]: begin or set in action, of meetings, speeches, recitals, etc.; "He opened the meeting with a long speech"

38. [Verb]: have an opening or passage or outlet; "The bedrooms open into the hall"

39. [Verb]: become available; "an opportunity opened up"

40. [Verb]: cause to open or to become open; "Mary opened the car door"

41. [Verb]: spread out or open from a closed or folded state; "open the map"; "spread your arms"

42. [Verb]: afford access to; "the door opens to the patio"; "The French doors give onto a terrace"

1. active

2. available

3. unprejudiced

4. impartial

5. unfolded

6. empty

7. honest

8. honorable

9. ingenuous

10. artless

11. unlawful

12. unconstricted

13. unobstructed

14. ajar(p)

15. wide-open

16. opened

17. unstoppered

18. yawning

19. agape(p)

20. gaping

21. agaze

22. staring

23. round-eyed

24. wide-eyed

25. wide

26. yawning

27. unenclosed

28. bald

29. barefaced

30. naked

31. raw

32. undisguised

33. obvious

34. visible

35. public

36. unprotected

37. unrestricted

38. unsealed

39. unconcealed

40. unsettled

41. coarse

42. susceptible

43. vulnerable

1. fold

2. fold_up

3. turn_up

4. close

5. shut

6. close

7. shut

8. close

9. close

10. close

11. fold

12. shut_down

13. close_down

14. shut

15. unopen

16. closed

17. closed

18. closed

19. shut

20. stopped

21. closed

22. covert