unobstructed

adjectives

free from impediment or obstruction or hindrance
"an unobstructed view"
antonym
is similar to
affording free passage or view
"a clear view"; "a clear path to victory"; "open waters"; "the open countryside"
is similar to
(of a bodily tube or passageway) open; affording free passage
"patent ductus arteriosus"
is similar to
not slowed or prevented
"a time of unimpeded growth"; "an unimpeded sweep of meadows and hills afforded a peaceful setting"
is similar to
freed of obstructions
"an unclogged drain"