Use the word "positive" to describe good feelings. We also use "positive" when describing attitudes, opinions, certainty, comments, and results. "Positive" is the opposite of "negative."
Kevin is feeling positive about his chances of finding a new job.
Wendy went to work with a positive attitude this morning.
Your chances of success are greater if you remain positive.
Try to be positive.
It’s good to be positive, but you also need to be realistic.
Zooey says she’s not positive about who her roommate will be next year at school.
Are you positive that you locked the door?
The witness can positively identify the people who were involved in the crime. (The word "positively" is an adverb.
The results of the pregnancy test were positive. Bruce tested positive for performance enhancing drugs.
The mayor’s decisions have had a positive impact on the city.
The reviews for last night’s performance have been positive.
We’re hoping for positive news, but we’re also bracing for the possibility of bad news.
When jumping a battery, attach the jumper cables to the positive terminals first.