1. Uninvited 
2. Not bidden; not commanded

Encyclopedia: Unbidden

• ackee
• acknowledge
• acknowledgeable
• acknowledged
• acknowledgement
• acknowledgment
• ACLANT
• aclinic line
• acme
• acne
• acne rosacea
• acne vulgaris
• acned
• acneiform
• Acnidosporidia
• Acocanthera
• Acocanthera oblongifolia
• Acocanthera oppositifolia
• Acocanthera spectabilis
• Acocanthera venenata
• Acokanthera
• acold
• acolyte
• Aconcagua
• aconite