57520
> 私ははっきりとは知らない。  
>  私ははっきりに知らない。

はっきりに means clearly but I'm not sure about はっきりとは and what's the difference
between both.

Thanks in advance.
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2018-03-25T04:30:08.873
57519
2018-03-25T05:21:59.893
2018-03-25T04:41:20.663
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question
grammar word-choice
はっきりとは/に what's the difference?
Check the word class of はっきり. From jisho.org:

[![enter image description
here](https://i.stack.imgur.com/BIf3r.png)](https://i.stack.imgur.com/BIf3r.png)

はっきり is an **adverb** that [optionally takes
と](https://japanese.stackexchange.com/q/24943/5010). はっきりに is always
ungrammatical because it's not a na-adjective in the first place.

は in はっきりと **は** 知らない is a contrast marker. In this case, this は implies that
the speaker does not know much about the matter, but he _at least vaguely_
knows about it.

はっきり(と)知らない can mean "I absolutely know nothing", but usually まったく知らない or
全然知らない is used for this meaning.
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2018-03-25T05:15:34.503
57520
2018-03-25T05:21:59.893
2018-03-25T05:21:59.893
5010
5010
57519
answer