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