Adams' side have now lost three consecutive Clydesdale Bank Premier League matches after seeing their 2-1 lead wiped away with three Hearts goals in as many minutes. Steffen Wohlfarth's double had put them in position for victory, the German scoring either side of a Michael Ngoo header.
However, Jason Holt levelled the match 11 minutes from time and the hosts were in front 60 seconds later when Evangelos Oikonomou put through his own net. Ngoo then added a fourth in the 84th minute.
The visitors had dominated the first half and Adams was aggrieved to eventually take nothing from the match.
He said: "I can't believe we lost the game. I felt we should have been 4-0 up at half-time. Sometimes that happens in football. We haven't taken our chances and we've been punished. Against Kilmarnock last week it was similar. We give our opponents a doing and get nothing from the game, and it was the same.
"We've had a few one-on-ones with the goalkeeper, and even at 4-2 we had a great chance to get right back in the match. If you don't take your chances you won't win the game. At times in the second half we really didn't defend well, which is disappointing.
"In terms of performance and possession I thought we were the better team, but we've come away with nothing. The midfield and attack should have had it done in the first half and the defence should have done better in the second. Collectively we've not done well enough."
For Hearts it saw the first victory for new manager Gary Locke since the former captain became the club's permanent boss early last month. Locke was delighted with the win but encouraged his players to repeat the second-half display that saw them steal all three points.
He said: "It's a great feeling. I said to the players afterwards that I want more from what I saw of them in the second half and less of what they gave me in the first. We tried to be more positive in the second half. I wasn't happy with what I saw in the first. We tried to go more attacking.
"Sometimes as a manager you get lucky with your substitutes. In the first half we didn't play well enough. Second half I was a lot happier. County will feel aggrieved that they didn't get anything out of the game and justifiably so. I want to reserve special praise for our goalkeeper, Jamie MacDonald. He made three outstanding saves that kept us in the game."
- Sports & Recreation
- Clydesdale Bank Premier League