50 Heb “in a place of a land of darkness” ( similar); “in some dark land.”
51 “In vain” translates תֹהוּ (tohu), used here as an adverbial accusative: “for nothing.”
52 The translation above assumes that צֶדֶק (tsedeq) and מֵישָׁרִים (mesharim) are adverbial accusatives (see 33:15). If they are taken as direct objects, indicating the content of what is spoken, one might translate, “who proclaims deliverance, who announces justice.”

In other versions

I did not speak in secret,

in a land of darkness;

I did not say to the offspring of Jacob,

‘Seek me in vain.’

I the Lord speak the truth;

I declare what is right.

I have not spoken in secret,

from somewhere in a land of darkness;

I have not said to Jacob’s descendants,

‘Seek me in vain.’

I, the Lord, speak the truth;

I declare what is right.

I have not spoken in secret,

somewhere in a land of darkness.

I did not say to the descendants of Jacob:

Seek me in a wasteland.

I am the Lord, who speaks righteously,

who declares what is right.

I publicly proclaim bold promises.

I do not whisper obscurities in some dark corner.

I would not have told the people of Israel to seek me

if I could not be found.

I, the Lord, speak only what is true

and declare only what is right.

I have spoken not in secrecy, in a place, a land, of darkness,

I have not said to the descendants of Jacob, ‘Seek me in vain!’

I, Yahweh, am speaking righteousness,

declaring uprightness.

I have not spoken in secret, in a dark place of the earth:

I said not unto the seed of Jacob, Seek ye me in vain:

I the Lord speak righteousness, I declare things that are right.

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