Well you have your: Sins not unto death 1Jn:5:17: All unrighteousness is sin: and there is a sin not unto death. Sins of Ommission. Which means failure to do things the Bible tells you that you ought to be doing. Willful Sins. Heb:10:26: For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins, Blasphemy against the Holy Spirit that cannot be forgiven. Sins that make you fall away where it is impossible to be renewed again to repentance Hebrews 6:4-6 4: For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, And have tasted the good word of God, and the powers of the world to come, If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame. Blasphemy against the Holy Ghost Mt:12:31: Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men.