atavism /atˈə-vi-zm/

1. The reappearance of ancestral, but not parental, characteristics
2. Reversion to an ancestral, or to a primitive, type

• ill-beseeming
• ill blood
• ill-boding
• ill-bred
• ill breeding
• ill-conditioned
• ill-considered
• ill-deedly
• ill-defined
• ill-disposed
• Illecebraceae
• Illecebrum
• illegal
• illegalise
• illegalised
• illegalises
• illegalising
• illegalities
• illegality
• illegalize
• illegalized
• illegalizes
• illegalizing
• illegally
• illegals