In Jain Dharma, śubh and aśubh mean:

• Śubh = auspicious, pure, wholesome, spiritually beneficial
• Aśubh = inauspicious, impure, harmful, spiritually unfavorable

In simple Jain understanding:

• Śubh bhāva means a good inner state of mind, speech, and conduct that leads toward punya and spiritual uplift.
• Aśubh bhāva means a disturbed, harmful, or impure state that leads toward pāpa and bondage of karma.

Examples

Śubh actions/bhāva:

• Ahimsā, satya, aparigraha
• Compassion, forgiveness, humility
• Worship, prayer, meditation, restraint

Aśubh actions/bhāva:

• हिंसा, lying, stealing, attachment, anger, pride, deceit, greed
• Harmful thoughts, harsh speech, bad conduct

Important Jain view

In Jain philosophy, even śubh is still within the realm of karma, though it is better than aśubh. The highest goal is to go beyond both śubh and aśubh through pure soul-awareness and liberation.

So, in short:

• Śubh = good and spiritually helpful
• Aśubh = bad and spiritually harmful

If you want, I can also explain shubh-asubh in karmic terms in a very simple Jain way.