Neutral:
* calmly
* quietly
* softly
* loudly
* clearly
* briefly
* simply
* directly
* honestly
* thoughtfully
* carefully
Positive:
* happily
* joyfully
* enthusiastically
* proudly
* confidently
* gratefully
* lovingly
* playfully
* humorously
* optimistically
Negative:
* angrily
* sadly
* tearfully
* frustratedly
* disappointedly
* wearily
* suspiciously
* guardedly
* hesitantly
* reluctantly
Other:
* sarcastically
* ironically
* jokingly
* teasingly
* sharply
* urgently
* impatiently
* desperately
Note: The best adverb to use will depend on the specific context and the speaker's intended meaning.