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The draw ensures the Reds will play finals football but they won t know their position on the table until the conclusion of the Macarthur-Wellington fixture on Friday night.
The Reds took an early lead but soon fell behind after two quick goals from the visitors.
A red card to Tass Mourdoukoutas late in the first half gave Adelaide some hope of salvaging the contest and their playoffs hopes.
United started with intent and dominated play early with Louis D Arrgio forcing Wanderers keeper Daniel Margush into a great save early on, diving low and tipping around the post.
Brisbane Roar and Wellington Phoenix notched two wins apiece in Matchweek 22 to strengthen their respective claims to play Finals Series football in 2020/21.
The two top-six aspirants were the big movers in a Matchweek where Melbourne City became the 2020/21 Premiers aftera 1-0 win over Central Coast Mariners at AAMI Park on Saturday night.