Definitions:

1. (of soil) unstable adjective
   • shifting sands
2. changing position or direction adjective
   • I drifted into the shifting crowd.
3. continuously varying adjective
   • taffeta with shifting colors
4. the act of moving from one place to another noun
   • One student's constant shifting disrupted the class.

Synonyms:

• shift
• shifty
• unfirm