1. (informal) in a state of confusion 
2. (informal) in dispute; in disagreement

Encyclopedia: At sixes and sevens

• admit
• admittable
• admittance
• admittedly
• admittible
• admix
• admixture
• admonish
• admonisher
• admonishing
• admonishment
• admonition
• admonitory
• adnate
• adnexa
• adnexal
• adnoun
• ado
• adobe
• adobe brick
• adobe house
• adobe lily
• adobo
• adolesce
• adolescence