Garry Monk frustrated after Cardiff defeat
Sean Morrison headed Cardiff's first goal midway through the second half and striker Kenneth Zohore side-footed home their second 10 minutes later.
Leeds had won their previous six games on home soil, keeping clean sheets in all of them, but Cardiff put more daylight between themselves and the bottom three.
And Monk admitted his side had found it hard to make headway against resilient opposition.
Leeds won their preview six games at Elland Road before Cardiff defeat
"Frustrating day and frustrating result for us," Monk said. "I said to the players that's something new for the group.
"I think it's the first time we've faced a team who have been set up to frustrate and defend very well, be hard to break down and leave no space behind them.
"We had to try and be patient and move the ball and move their shape to try and create spaces.
"Unfortunately we made two mistakes which cost us two goals and put us out of the game."
Championship relegation odds 2016/17
Fri, February 10, 2017
Express Sport brings you the full list of Championship relegation odds for 2016/17, compiled from the best prices on oddschecker.com
Get Quotes on Home Insurance
1 of 25
Who are favourites to be relegated from the Championship?
Monk confirmed influential defender Pontus Jansson is not expected to shake off the illness which kept him out in time for Tuesday's visit of Bristol City.
The former Swansea defender added: "Because of how well we've done here, I think teams will come and respect us a little bit – set up in a way Cardiff did.
"It's for us to face, get ready for and try and overcome."