'Spiritual' in the Bible

For certain people have crept in unnoticed [just as if they were sneaking in by a side door]. They are ungodly persons whose condemnation was predicted long ago, for they distort the grace of our God into decadence and immoral freedom [viewing it as an opportunity to do whatever they want], and deny and disown our only Master and Lord, Jesus Christ.

These are the ones who are [agitators] causing divisions—worldly-minded [secular, unspiritual, carnal, merely sensual—unsaved], devoid of the Spirit.