Brennan Johnson admits Tottenham deserved nothing at Wolves after their late collapse made it back to back defeats for Ange Postecoglou's side.
Pablo Sarabia and Mario Lemina struck in stoppage time as the hosts claimed a deserved 2-1 win.
Johnson's third-minute strike gave Spurs the lead but they were second best from then onwards.
Ange Postecoglou's side missed the chance to go two points clear at the top of the Premier League and have now suffered successive defeats.
'It happens in football, we've enjoyed late goals and now we're tasting defeat and it's really sickening. All the boys are feeling the same,' Johnson told the club's official site. 'We can't complain too much because we didn't really kill the game off.
'It's tough to take but it's about how we perform. There were certain things we could have done better in terms of moving the ball and getting into better positions.
'We started well, it came with a goal, but after that we went back into the head space of getting three points and that's not the mentality to have. We wanted to be safe, we went into safety mode where if we see it out we'll get three points.'
Wales forward Johnson opened the scoring from Pedro Porro's cross after three minutes but Wolves reacted well and dominated the rest of the game.
Lemina went close and Hwang Hee-Chan missed a golden chance soon after the restart. Jose Sa saved from Giovanni Lo Celso just as it looked like Spurs would hold on, until Wolves' late show.
Sarabia struck in the opening seconds of stoppage time when he collected Matheus Cunha's pass and volleyed in. He then turned provider in the seventh minute of injury time, finding Lemina to prod in the winner.
Victory moved Wolves onto 15 points and nine clear of the relegation zone
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