aThe same consonants with different vowels would be translated “be blinded,” which fits the context better
bLiterally “heart”
cLiterally “to know”
dHebrew “tongue”

In other versions

Then the eyes of those who see will not be closed,

and the ears of those who hear will give attention.

The heart of the hasty will understand and know,

and the tongue of the stammerers will hasten to speak distinctly.

Then the eyes of those who see will no longer be closed,

and the ears of those who hear will listen.

The fearful heart will know and understand,

and the stammering tongue will be fluent and clear.

Then the eyes of those who see will not be closed,

and the ears of those who hear will listen.

The reckless mind will gain knowledge,

and the stammering tongue will speak clearly and fluently.

Then everyone who has eyes will be able to see the truth,

and everyone who has ears will be able to hear it.

Even the hotheads will be full of sense and understanding.

Those who stammer will speak out plainly.

And the eyes of them that see shall not be dim,

And the ears of them that hear shall hearken.

The heart also of the rash shall understand knowledge,

And the tongue of the stammerers shall be ready to speak plainly.

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