-ily
                suffix
     -          forming adverbs corresponding to adjectives ending in -y (such as happily corresponding to happy)[构成以-y 结尾形容词的相应副词, 如由happy 构成happily]。
词源
see -Y 1, -LY 2.
-ily
Suffix
- Forms adverbs from nouns and verbs whose derived adjectives are suffixed with -y. - greed → greedy → greedily
- noise → noisy → noisily
- fun → funny → funnily
 
Etymology
Combination of -y (“adjectival suffix”) + -ly (“adverbial suffix”), with -y changed to -i-.