offen
ajar
ambient air temperature
drophead
frank
lofty
loose
loosely woven fabric
non-enclosed
non-protected
on
open circuited
open ended
open loop
open not closed
open-circuited
open-ended
open-hearted
open-top
open-type
open
outdoor-type
outdoor
outstanding
plain
receivable
straightforward
to open-ended
to open
unassigned
undecided
unenclosed
unsealed
vacant