General synonyms:
* Timid: This is a close synonym to shy, suggesting fearfulness and hesitation.
* Bashful: This implies a sense of awkwardness and embarrassment.
* Diffident: This suggests a lack of confidence and self-assurance.
* Reserved: This describes someone who is quiet and doesn't reveal much about themselves.
* Introverted: This describes someone who gains energy from being alone and prefers smaller social settings.
* Unassuming: This describes someone who is modest and doesn't draw attention to themselves.
More specific synonyms:
* Coquettish: This describes someone who is flirtatious and playful, but also shy or hesitant.
* Modest: This describes someone who is humble and doesn't brag about their accomplishments.
* Self-conscious: This describes someone who is overly aware of their own appearance or actions.
* Wallflower: This is a figurative term for someone who is shy and avoids social interaction.
* Reticent: This describes someone who is unwilling to talk or share information.
Antonyms:
* Outgoing: Someone who is friendly and enjoys socializing.
* Bold: Someone who is brave and confident.
* Assertive: Someone who is confident and direct in their communication.
The best word to use will depend on the specific situation and the nuance you want to convey.