Agreeable:
* Pleasant
* Delightful
* Enjoyable
* Charming
* Attractive
* Amiable
* Friendly
* Cordial
* Nice
* Pleasing
* Acceptable
* Satisfactory
Curiosity:
* Inquisitiveness
* Wonder
* Interest
* Nosiness (can have a negative connotation)
* Thirst for knowledge
* Desire to learn
* Exploration
* Investigation
* Prying (can have a negative connotation)
* Intrigue
* Scrutiny
The best synonym to use will depend on the specific context. For example, if you are talking about someone's personality, "amiable" might be a good synonym for "agreeable." If you are talking about a situation, "pleasant" might be more appropriate.
Similarly, "inquisitiveness" might be a good synonym for "curiosity" when describing someone's personality, while "wonder" might be better suited for describing a feeling.