Impracticable (adjective)

1. Not capable of being put into practice or accomplished; infeasible.
2. Not capable of being used or dealt with in a practical way.
3. Not reasonable or convenient to do.

Origin:

From the latin in- (not) + practicus (practical) + -able (an adjective suffix).

Examples:

1. The plan was deemed impracticable due to lack of resources.
2. The idea was impracticable and was eventually abandoned.
3. The solution was impracticable as it required too much effort and money.
4. The proposal was impracticable as it was not in line with the company's goals.
5. The impracticable nature of the project led to its cancellation.