German-English translations for eigenwillig

wayward
arbitrary
us
Benjamin Franklins designation of "positive" and "negative" to different charges was arbitraryThe decision to use 18 years as the legal age of adulthood was arbitrary, as both age 17 and 19 were reasonable alternativesThe equation is true for an arbitrary value of x

headstrong
us
He was in that headstrong teenage phase when he felt like he knew everything.
idiosyncratic
maverick
us
He made a maverick decision. She is such a maverick person
wilful