David Wagner felt "bravery" was one of the key factors that went against his Huddersfield side as they lost 2-0 to Swansea.
The Terriers found themselves in a comfortable position for much of the first half, as their Welsh counterparts allowed them plenty of space in which to play their game, but three minutes before the break Tammy Abraham seized on a goalkeeping error by Jonas Lossl to put the Swans in front.
Wagner introduced Aaron Mooy at half-time in a bid to kickstart a response, but just three minutes after the restart Mooy was inadvertently involved in the second as his tackle carried the ball into the path of Jordan Ayew, who dinked for Abraham to tuck home a second from point-blank range.
The German reckoned his side acquitted themselves well in the second half at the Liberty Stadium, but questioned their courage in the opening 45 minutes.
He said: "First half [we were] not good enough, not brave enough - I think bravery was a big problem for us in the first half. We had probably our biggest chance in the first half from Tom Ince as well. We were not brave enough in the first half and we didn't have the luck in the second.
"I think we created moments, we hit the bar and had a number of dangerous situations in the six-yard box, but unfortunately we were not able to score.
"I think it was a great tackle from Aaron Mooy, but unfortunately he tackled the ball into Ayew's feet - it was a very good finish. But this is exactly the situations that I meant - you have to invest in bravery if you like to be lucky."
There was a contentious decision just after the half-hour mark when Ince seemed to be brought down inside the area by Martin Olsson, but referee Paul Tierney waved away Huddersfield appeals, and Wagner argued a spot-kick should have been awarded.
He added: "As everybody has seen, there were a lot of situations against us - the Tom Ince situation where it could be a penalty or a free-kick. I think you could [blow the] whistle, I've seen red cards for these situations."
The Terriers have now scored just once in the league in their last six and not won a Premier League game since August 20.