not for lack/want of trying
not for (a) lack of trying
Despite putting forth a significant amount of effort or energy. A: "So, did he get you to go on a date with him?" B: "No. Not for lack of trying, mind you." I'm sorry your team lost, but it wasn't for a lack of trying!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
not for lack/want of ˈtryingused to say that although somebody has not succeeded in something, they have tried very hard: He’s had no success in finding a job, though not for lack of trying.
Farlex Partner Idioms Dictionary © Farlex 2017