Obstructed means blocked or impeded, so its antonyms are words that convey openness, ease, and freedom. Some of the antonyms for the word "more obstructed" are unblocked, accessible, clear, free, open, and liberated. These words describe a state of being unfettered and unimpeded and suggest a lack of hindrance or impediment. If something is accessible, it is easy to reach, approach or access. Similarly, if something is clear, there is no obstruction or obstacle in the way. Freedom and liberation also suggest an absence of restriction, restraint, or confinement. Therefore, using words with these antonyms can effectively communicate the opposite of something that is obstructed.