For most meanings of good, the opposite is bad, or possibly awful.
For good meaning "benevolent" the opposite would be evil(malevolent).
For good meaning "acceptable in quality" the opposite would be poor.
For good meaning "fresh" the opposite would be spoiled or gone bad.
In other applications, the opposite could be unacceptable, unsuitable, or useless.
what is a good sentence for the word opposite
The opposite of a good idea would be a bad idea. Depending on how bad you could also say terrible idea.
Durable good
A good opposite would be "murmur".
The opposite of evil is good, or benevolent.
guapo is good-looking in spanish so the opposite of good-looking is ugly which would be feo in spanish
The opposite of relevant is irrelevant.
It depends on the context of the word good. In this instance, the answer seems to be "evil" if you want the opposite of "Mother Theresa was a good person", without the answer "bad".
Good bye
good
ugly.
good boy