optionally
构词拆分
optional词根/词干
+
-ly后缀
Used to form adjectives from nouns, the adjectives having the sense of "behaving like, or having a nature typical of what is denoted by the noun" Similar in meaning to -like but most often paired with animate nouns. · Used to form adjectives from nouns, the adjectives having the sense of "appearing like, resembling, or having the likeness of what is denoted by the noun".
词源说明
释义（英文）
副词 Adverb
- In an optional manner; not mandatorily.