Definition that contains mental effort
- hard not easy; requiring great physical or mental effort to accomplish or comprehend or endure
- difficult not easy; requiring great physical or mental effort to accomplish or comprehend or endure
- recall the process of remembering (especially the process of recovering information by mental effort)
- concentration complete attention; intense mental effort
- invent come up with (an idea, plan, explanation, theory, or principle) after a mental effort
- forge come up with (an idea, plan, explanation, theory, or principle) after a mental effort
- mindless requiring little mental effort
- recollection the process of remembering (especially the process of recovering information by mental effort)
- arduous difficult to accomplish; demanding considerable mental effort and skill
- devise come up with (an idea, plan, explanation, theory, or principle) after a mental effort