He Put Me Back Together,
This is the scripture I am referring to with no intention on declaring I have a definition...okay?...just a thought only......

:
Luk 12:10And whosoever shall speak a word against the Son of man, it shall be forgiven him:but unto him that blasphemeth against the Holy Ghost it shall not be forgiven.f
Let scripture help with understanding.
Jn 16:7-9
7 Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.
8 And when he is come, he will reprove the world of sin, and of righteousness , and of judgment:
9 Of sin, because they believe not on me;
KJV
The Comforter or Holy Spirit's Job concerning the unsaved is described in the above scriptures.
Lk 12:10
And whosoever shall speak a word against the Son of man, it shall be forgiven him: but unto him that blasphemeth against the Holy Ghost it shall not be forgiven.
KJV
The word blashemeth is NT:987
Specifically, of those who by contemptuous speech intentionally come short of the reverence due to God or to sacred things (for gideep, 2 Ki 19:6,22.
(from Thayer's Greek Lexicon, Electronic Database. Copyright © 2000, 2003 by Biblesoft, Inc. All rights reserved.)
NT:987
eis to pneuma to hagion, Mk 3:29; Lk 12:10 (eis Theous, Plato rep. 2, p. 381 e.).
(from Thayer's Greek Lexicon, Electronic Database. Copyright © 2000, 2003 by Biblesoft, Inc. All rights reserved.)
An unsaved person who by contemptuous speech not reverencing God's Son as the Redeemer of man would reject that same Redeemer, thereby not receiving Him as Saviour.
That is a sin and is unforgivable, therefore that person is destined for hell.