I went inside then and in a moment he was gone. I watched him from my window as he went down the street. He was whistling softly

and I waited until the sound faded away so I couldn't tell if it was he or my heart whistling out there in the night. And then he was gone, completely gone. I shivered. Somehow the darkness seemed changed. The stars were little hard chips of light far up in the sky and the moon stared down with a sullen yellow glare. The air was tense with sudden cold and a gust of wind swirled his footprints into white oblivion. Everything was quiet. But he'd said, "I'll call you." That's what he said—"I'll call you." I couldn't sleep all night.
This excerpt from Daly's "Sixteen" conveys a _____ tone.
complacent
forlorn
gloomy
apprehensive