〜のみならず
not only (formal)
Noun / Plain form + のみならず … も
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のみ is a formal word for "only", and のみならず means "not only": この問題は日本のみならず、世界の問題だ, "this is a problem not only for Japan but for the whole world".
It's the most formal member of the "not only" family: だけでなく (neutral), ばかりでなく (a bit formal), のみならず (written, speeches). The second half usually has も.
It follows nouns directly, and plain forms of verbs and adjectives: 才能があるのみならず、努力家でもある.
At the start of a sentence, それのみならず means "moreover". You'll see のみ alone on signs too: 会員のみ, "members only".
Examples
この問題は日本のみならず、世界の問題だ。
This is a problem not only for Japan but for the whole world.
彼は才能があるのみならず、努力家でもある。
He's not only talented but hardworking too.
学生のみならず、社会人にも人気がある。
It's popular not only with students but with working adults too.
この薬は効果がないのみならず、副作用もある。
Not only does this medicine not work, it has side effects too.
国内のみならず、海外でも評価が高い。
It's highly rated not only at home but overseas as well.