Synonyms:
* Optimistic: This word implies a hopeful and confident outlook.
* Constructive: This word emphasizes the building and improving aspects of something.
* Beneficial: This word focuses on the positive effects or outcomes.
* Favorable: This word suggests a good or advantageous situation.
* Upbeat: This word denotes a cheerful and energetic attitude.
Antonyms:
* Negative: This is the most direct opposite of "positive" and implies pessimism, doubt, or unfavorable outcomes.
* Pessimistic: This word suggests a gloomy and negative outlook.
* Destructive: This word emphasizes the harmful or damaging aspects of something.
* Unfavorable: This word implies a bad or disadvantageous situation.
* Downbeat: This word denotes a sad or gloomy attitude.
The best synonym or antonym to use will depend on the specific context of your sentence.