The antonyms for the phrase "make impracticable" are "facilitate," "enable," "simplify," "ease," and "streamline." These terms refer to the act of making something possible, achievable, or feasible. Rather than making a task or goal seem unattainable or difficult, these antonyms describe the process of making it easy and straightforward to accomplish. For example, when building a bridge, a team of engineers may work to streamline the construction process, making it as simple and efficient as possible. In this way, they are enabling the project to be completed successfully and without unnecessary complications.