Common adjectives: good and bad things

(+) ‘good’ adjectives:

When you answer and want to say how you feel:
A: The train arrives at six o’clock; dinner is at seven.
B: Excellent! / Great! / Wonderful! / Lovely! / Perfect!

(-) ‘bad’ adjectives:

The weather last year was worse than this year.
Tim is a horrible person. Nobody likes him. (used about people)
I had a terrible day at work today, (used about situations)
The traffic’s terrible at 5 o’clock on Fridays.

Note: We often say not bad when we are speaking:
A: I get $500 a week in my job.
B: That’s not bad! (= good!)

You can say these adjectives with how:
A: I have to get up at 5.30 tomorrow.
B: Oh, how awful! / horrible! [NOT how bad]