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The context is the reader has just been told that in [blank] he 須認真.
[blank]須認真.若認不真. 便都成了假的.
What puzzles me is the 不 in the middle of 認真. I understand that each character by itself is a word, but it seems generally to be one two character word, "earnest". Is the 不 negating one of two words, or half of one word, or all of a two character word? I've never seen that.
「認真」is a common two characters compound word. It means 'serious' (adj.) Since it is an adjective, we can add the negative function word 「不」(not ) before it, and form an negative phrase 「不認真」(not serious)
However, 「認」on it's own can be the verb 'identify' or ' 'recognize' as in 「認人」(identify a person)，「認路」(recognize the way); while 「真」on it's own can be the adjective 'true' or 'accurate' ; or the adverb 'truly' or 'accurately'
As a simple grammatical rule, an adverb can modify a verb. Which mean 「認真」 can be treated as a [verb+ adverb] structure instead of a compound that we are familiar with.
In the case of 「認不真」，「不」being a negative function word that modifies the adverb 「真」make it clear that the term we are looking at, is in fact [verb+ 不 + adverb] structure (認+不+真).
If 「不」 is placed before 「認真」, that would make it an [不 + adjective] structure (不+認真).
As I mentioned before, 「認真」is a very common 'word' , to avoid confusion, it is better use 「認不清」 instead of 「認不真」.
I believe if the phrase in question was 「認不真確」instead of the shortened 「認不真」, you would not be so confused.
Since the common word 「認真」is widely used, putting 認 and 真 in a [verb + adverb] structure would certainly cause confusion. It is not recommended.
須認真.若認不真. 便都成了假的.
In this context 須認真 means " Need to identify accurately.
" Need to identify accurately. If not identify accurately, then everything will become (be treated as) fake"
I would suggest phrasing it as 「須認(得)真(確), 若認不真(確), 便都成了假的」 to make it more clear.
可能缺了一个了字，认不（了）真。意思是：我现在好烦，我认真不起来。
