Orderly
Systematic, Well Organized, Natural Order
adjective, adverb
せいぜん
整然 (せいぜん) Orderly, Systematic, Well Organized, Natural Order
体系的 (たいけいてき) Systematic
秩序 (ちつじょ) Order, Regularity, System, Method
当然 (とうぜん) Natural, Obvious, Of Course, Naturally
然 tends to make things adverbs.