The Opposite of Friend

What is the opposite of friend?
A dangling question;
Drowning fishes;
The Arizona Desert.
Unexpected silence.

Growing up in my family
Was much like hiding.

When I was little,
I owned a microscope set.

As it turns out,
I am all-seeing but not all-knowing.

When I close my eyes,
I hear a song:

‘Cause there’s a Continental Trailways leaving local bus tonight, good evening
You can have my seat, I’m sticking round here for a while
Get me a room at the Squire, the filling station’s hiring,
And I can eat here every night, what the hell have I got to lose?
Got a crazy sensation, go or stay? now I gotta choose,
And I’ll accept your invitation to the blues

I am not interested in geography;
What I want to know is,
When?

What is the definition of friend?