appointed, deputy, erect, establish, X Huzzah (by mistake for a proper name), lay, officer, pillar, present, rear up, set (over, up), settle, sharpen, establish, (make to) stand(-ing, still, up, upright), best state

Boyd’s Bible Dictionary:

(fixed). A possible queen of Nineveh (Nah. 2:7).

Concise Bible Dictionary:

This seems to be a symbolical name for Nineveh. The word signifies “established”; as in the margin. That which counts itself as established shall be carried away captive (Nah. 2:7).

Strong’s Dictionary of Hebrew Words:

Transliteration:
natsab
Phonic:
naw-tsab’
Meaning:
a prim root; to station, in various applications (literally or figuratively)
KJV Usage:
appointed, deputy, erect, establish, X Huzzah (by mistake for a proper name), lay, officer, pillar, present, rear up, set (over, up), settle, sharpen, establish, (make to) stand(-ing, still, up, upright), best state

Potts’ Bible Proper Names:

Molten; fixed or determined; beautifully beaming:―queen of Nineveh, Nah. 2:7. {Fusus}