Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Proudly is regular. It follows the -ies Conversion rule.
Use plural verbs: "The proudlies are ready" (not "is ready").
Yes. The plural proudlies is standard across all English variants.
The word proudly follows the standard English pluralization rule. When forming the plural, proudly becomes proudlies. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why proudly becomes proudlies helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using proudlies in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The proudlies are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.