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