
Not for want/lack of trying
Effort Acknowledged
Indicates that failure wasn't due to a lack of effort or dedication on someone's part.

She didn't win the competition, but it wasn't for lack of trying.
Subtle Encouragement
Can subtly encourage or console someone after an unsuccessful attempt.

I know you didn't pass this time, but it wasn't for want of trying.
Context Sensitive
Best understood in contexts involving attempts at achieving difficult tasks or goals.

The summit was unreachable due to weather, not for lack of trying.
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