which is the prefix in disappointedly?\ndis-\nappoint\n-ed\n-ly

Brief Explanations:

A prefix is a word - part added at the beginning of a word. In the word "disappointedly", "dis -" is added at the start. "Appoint" is the root word. "-ed" is a suffix (used to form the past - tense or past - participle form of verbs in many cases). "-ly" is also a suffix (used to form adverbs from adjectives).

Answer:

dis -