WordNet sense 1 (in the open air):

alfresco

WordNet sense 2 (located, suited for, or taking place in the open air):

out-of-door, outdoor

WordNet sense 3 (very unlikely):

remote

WordNet sense 4 (has little chance of being the case or coming about):

unlikely

WordNet sense 5 (coming from the outside):

extraneous

WordNet sense 6 (carried on outside the bounds of an institution or community):

extramural

WordNet sense 7 (from or between other countries):

international

WordNet sense 8 (of concern to or concerning the affairs of other nations (other than your own)):

foreign

WordNet sense 9 (happening or arising or located outside or beyond some limits or especially surface):

external

WordNet sense 10 (situated in or suitable for the outdoors or outside of a building):

exterior

WordNet sense 11 (outside a building):

outdoors

WordNet sense 12 ((of a baseball pitch) on the far side of home plate from the batter):

away

WordNet sense 13 (not accurate):

inaccurate