> 
> [Galatians 5:19 Now](https://biblehub.com/galatians/5-19.htm) the works of the flesh are manifest, which are
>  these; Adultery, fornication, uncleanness, lasciviousness,
> 
> 
> 

What is the difference between adultery, fornication, uncleanness & lasciviousness in the verse above? I looked into the Greek from [this website](http://www.godrules.net/library/kjvstrongs/kjvstrongsgal5.htm) but could not understand well.
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The word ἀδελφός (adelphos) occurs well over 300 times in the NT for which BDAG has two basic meanings:

> 
> (1) **a male from the same womb as the reference person, *brother***,
>  eg, **Matt 1:2, 11, 4:18, 21, Gal 1:19**, etc. … Hence there is no
>  doubt that in Luke 21:16 that the plural "adelphoi" = brothers and
>  sisters …
> 
> 
> **(2) a person viewed as a brother in terms of a close affinity, *brother, fellow member, member, associate***
> 
> 
> (a) one who shares beliefs eg, matt 12:50, Mark 3:35 … 
> 
> 
> (b) a compatriot Lev 10:4, 15:3, 12, 17:15, Acts 2:29, 3:17 etc.
> 
> 
> (c) without reference to a common nationality or faith, neighbor 9or
>  an intimate friend), eg, Matt 5:22, 7:3, etc.
> 
> 
> (d) Form of addressused by a king to persons in very high position -
>  (used in classical, non-Biblical literature)
> 
> 
> 

I have only included the highlights from BDAG to provide the general idea. For more detail consult BDAG. However, it appears correct that "adelphos" can, indeed, be used in the sense of fellow countryman or compatriot, or even close associate.
In I John 2:12, the very next verse, John speaks to 'little children'.

In such a context, it is my own understanding that the 'brother' referred to in the previous few verses would be a sibling. Or like a sibling - namely a brother in Christ.

To hate one's own Christian brother is a terrible thing. I believe that is what John is talking about.