Opposite of "arrogant"/"having attitude"

1. Are self-abased and humble both opposite to arrogant or having attitude? What are their differences?
2. What are words for the opposite to arrogant, respectively in a positive, negative, and neutral way?

Solution 1:

Both self-abased and humble can be considered as antonyms for arrogant. The difference between them in this context being

Humble - Not showing arrogance in spite of knowing that one is good.

Self-abased - Not showing arrogance because he feels he is not good. (Inferiority complex, may be)

Some other antonyms for arrogant are

Modest - Positive

Shy - Neutral

Meek, Servile, timid - Negative

Of course, whether something is positive, negative or neutral will depend on the context it is spoken, people who are engaged in the conversation, how it is said etc. But I feel this can be considered as a broad classification.