1.
You use ~ to describe something that seems very strange and unnatural.
For a few seconds we watched the ~ lights on the water...
The sound was so serene that it seemed ~.
ADJ: usu ADJ n
2.
If you refer to a time as an ~ hour, you are emphasizing that it is very early in the morning.
They arranged to meet in Riverside Park at the ~ hour of seven in the morning.
= ungodly
ADJ: ADJ n emphasis
3.
An ~ noise is unpleasant because it sounds frightening and unnatural.
She heard the sirens scream their ~ wail.
ADJ: usu ADJ n