unnoticeably

词干

后缀

-ly: 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".