sexennial /sek-senˈyəl or -senˈi-əl/

1. Lasting six years
2. Recurring every six years

sexennˈially adverb

• unfollowing
• unfollows
• unfool
• unfooled
• unfooling
• unfools
• unfooted
• unforbid
• unforbidden
• unforced
• unforced error
• unforcedly
• unforcible
• unfordable
• unforeboding
• unforeknowable
• unforeknown
• unforeseeable
• unforeseeing
• unforeseen
• unforeskinned
• unforested
• unforetold
• unforewarned
• unforfeited