[Advaita-l] A help required regarding some Sanskrit words

[V Subrahmanian]

Namaste.

Here are some pairs of words:

अनपेक्षः  - निरपेक्षः  (not longing for anything)
अनवद्यं   - निरवद्यं  (faultless)
अनवकाशः  - निरवकाशः (bereft of occasion)
अनुक्त.... -  निरुक्त... (not the VedAnga) (unsaid)

By the way, is the word निरुक्त used in a compound like: निरुक्ततात्पर्यम् ?
(to mean: unsaid purport)

Is there any difference in the meanings of the words in each of the pairs?
If so what is the difference?

Om Tat Sat