Ross County manager Derek Adams questioned the hunger of his players as they lost 2-0 to Hearts at Tynecastle.
Jamie Hamill scored a penalty then was sent off amidst the celebrations after a touchline tussle with Adams.
Dale Carrick added a late second to leave the Dingwall men languishing in the relegation play-off spot.
"We had chances, but we didn't take them," Adams told BBC Radio Scotland. "But we have to show a bit more hunger than we did today."
Partick Thistle's late win away to Kilmarnock means County trail both sides by two points ahead of next week's home clash with the Rugby Park men.
"I thought in the first-half it was an even match - both teams cancelling themselves out and both teams having opportunities on goal," said Adams.
"In the second-half, Hearts obviously got the penalty kick, which from my point of view I thought was a little bit soft on the edge of the box. I haven't seen it again yet, but just from where I was, I was unsure if it was a foul.
"They get the penalty then obviously they score on the counter attack and we're trying to get back to 1-1.
"Hearts played well today. They've a lot of good young players in their team, they've got good experienced players in their side as well, and I thought that they showed a really good hunger today.
"I'm disappointed with my players because we had to match that enthusiasm and I didn't think we did that today.
"We need to play a lot better than we did in the second half. The game was there for both sides to win and Hearts got that impetus by getting the penalty kick and scoring.
"I can't question them at times, but I thought at times today Hearts young kids showed us what hunger is to go and play football.
"The supporters have travelled in their thousands to get here, it's a beautiful day and you want to go and give them something back, but we weren't able to do that today.
"We've got four games to go, four tough games, and we'll have to go and pick up points now."