Quote three words to show that the speaker did not rush their decision when they chose the road in "The Road Not Taken."

It does seem that the speaker takes their time in choosing which of the two roads they want to take. In fact, the speaker wishes that they could try them both, but they know that this is not really possible.
First, the speakers says, "long I stood" (line 3). The word long emphasizes just how much time they took in making this decision; it was not a short amount of time—as the speaker stood there for a long time, thinking it all over. Next, they say that they "looked down one [road] as far as [they] could," tracing it with their eyes until it bent into the brush and the speaker could no longer see it (4). From this quotation, the word far emphasizes how keenly they attempted to examine the first road in order to make the best decision.
Furthermore, the speaker says that they "then took the other, as just as fair" to explain that they then examined the second of the two roads in front of them (6). The word then shows how measured this examination was: first, the speaker looks over the first road and considers its appearance and potential. Then, they look over the second road and consider its appearance and potential, and the speaker even goes on to compare and contrast the two. This shows that they did not rush this decision.