The Spurs forward opened the scoring in the North London derby but was sent off after just 18 minutes and could only watch as his former club routed his current one.
The 28-year-old opened the scoring for the visitors after 10 minutes, but he received his marching orders after a high challenge on Santi Cazorla that left referee Howard Webb with no option but to give a straight red card. And while the Spurs forward stressed his tackle was in no way malicious, he accepted that his actions cost his side the victory, which leaves the club 11 points off league-leaders Manchester City.
"I completely understand my sending off changed the entire outcome of the game and I whole-heartedly apologise to my teammates, the manager and all the Tottenham fans for letting them down," Adebayor told The Sun. "Nobody could have felt more devastated than me as I walked off the pitch.
"I so much wanted to help Tottenham win and thought for a moment that I'd actually set that win up when I scored, but football changes so quickly. One minute a hero, the next a villain."
The forward suggested that while his tackle was foolish so early on in the game, it was an honest attempt to regain possession, with Cazorla being too quick for him.
"I must stress that my challenge was not malicious in any way whatsoever," Adebayor said. "I was genuinely trying to win the ball and probably stretched my foot out a bit too far in the heat of the moment."