To blaspheme is to utter blasphemies, that is, to use words that outrage divinity or something respectable. Outrage is serious offense; insult; offense to dignity.
Blasphemy against the Holy Spirit is anything that offends Him or does not accept His dignity. The curses that some human beings direct at the Holy Spirit is blasphemy. Denying the Holy Spirit by not wanting to give Him His due place can be an offense to His dignity and constitute blasphemy.
Biblical references:
A) TO BLASPHEME:
The sin of the Christian, causing scandal, may give rise to blasphemies by the enemies of the gospel and cause him much harm, as Nathan explained to King David.
II Samuel 12.14 “However, because by this deed you have given the enemies of the Lord great occasion to blaspheme, the child also who is born to you shall surely die”.
Jo 1.11 “But stretch out your hand and touch all that he has, and he will surely curse you to your face!”. Jo 2.5 “curses you...”
Psalms 10.3 “blasphemes the Lord”
Psalms 10.13 “Blasphemes God...”
Psalms 74.10 “the enemy will blaspheme...”
Psalms 74.18 “blasphemed your name...”
Isaiah 1.4 “They have blasphemed the Holy One...”
Isaiah 52.5 “name is blasphemed...”
Matthew 9.3 “he blasphemes...”
Matthew 26.65 “saying: He blasphemed...”
Matthew 27.39 “They blasphemed Him...”
Mark 3.28 “Truly I say to you, all sins will be forgiven to the sons of men, and all manner of blasphemies with which they blaspheme”
Mark 3.29 and 30. “But whosoever shall blaspheme against the Holy Ghost, hath never forgiveness, but is in danger of eternal damnation. (Because they said: He has an unclean spirit)”
Mark 15.29 “blasphemed Him...”
Luke 23.39 “hanging blasphemed...”
Jo 10.36 “you say: you blaspheme... “
Romans 2.24 “of God is blasphemed...”
Romans 3.8 “we are blasphemed...”
I Corinthians 4.13 “we are blasphemed... “
I Corinthians 10.30 “because I am blasphemed...”
I Timothy 1.20 “learn not to blaspheme...”
I Timothy 6.1 “not be blasphemed...”
Titus 2.5 “not be blasphemed...”
James 2.7 “blaspheme they the good...”
I Peter 3.16 “blaspheme your...”
II Peter 2.2 “the...shall be blasphemed...”
Revelation 16.11 “blasphemed the God...”
Revelation 16.21 “men blasphemed...”
B) BLASPHEMY
Daniel 3.29 “whoever says b. against...”
Matthew 12.31 “All sin is b. if...“
Matthew 15.19 “false witness and b ...“
Mark 7.22 “b. pride, foolishness...”
Mark 14.64 “You have heard the b.; what...”
Luke 5.21 “Who is this who speaks b.?...”
Ephesians 4.31 “and all malice...”
I Timothy 6.4 “envies, strife, b.”
Revelation 13.5 “great things and b.”
C) BLASPHEMER
I Timothy 1.13 “me, who was a b.”
II Timothy 3.2 “b. disobedient to parents,”