'lack of concrete' is a correct and usable phrase in written English.
For example, "The lack of concrete evidence made it difficult to determine the cause of the accident."
Many lawsuits are lost over a lack of concrete evidence about employment decisions.
But because of lack of concrete evidence, they couldn't put them in jail.
This lack of concrete facts has got me into quite a bit of trouble.
Those who deride it for its lack of concrete demands simply don't understand its strategic function.
Much has been said regarding the lack of concrete demands of the Occupy movement.
They have seized on her lack of concrete proof about Madoff to portray her as unreliable.
Responses from the indie community have so far been guarded – mostly due to the lack of concrete information.
Some just accept the inherent loneliness that comes with the lack of concrete ties to any single place.
The groups Save the Children and Human Rights Watch, however, issued separate statements denouncing the lack of concrete achievements.
It's an approach that can work in fables, but in Wilson's highly particular world the lack of concrete experience makes some stories feel unfinished.
Despite the lack of concrete results, the three-way summit meeting won wide attention in the region for being held at all.
