一辺倒 いっぺんとう
ippentō

Noun
Suffix

1. complete devotion (to); total commitment (to); unvarying support (for); unwavering fixation (on); rigid preoccupation (with)

かれ保守 ほしゅ とう一辺倒 いっぺんとう とうした。
karewa hoshutōippentōde oshitōshita.
He has remained pro-conservative throughout.