So how do we produce readable and clean scientific writing? One of the good elements of style is to avoid adverbs and adjectives (Zinsser 2006). Adjectives and adverbs sprinkle paper with ...

Japanese adjectives conjugate to become adverbs. We can change I adjectives that end with syllable I, such as HAYAI (early), to adverbs by changing the final I to KU. So, HAYAI becomes HAYAKU.