I'm sad.
I'm down.
I'm unhappy.
I'm upset.
I'm depressed.
I'm cheerless.
I'm despairing.
I'm gloomy.
I'm glum.
I'm grief-stricken.
I'm heartbroken.
I'm low.
I'm low-spirited.
I'm melancholy.
I'm pessimistic.
I'm somber.
I'm sorrowful.
I'm sorry.
I'm troubled.

I am just sad.

Only one or two knows why I'm sad. The rest doesn't.
Too bad cuz I ain't telling anyone already.

I lost my appetite and my mood today.
Guess I'll be skipping my dinner tonight and sleep early.

Ever has it been that love knows not its own depth until the hour of separation..