Definify.com

Webster 1828 Edition

ppr.

Unfixing; removing from a settled state.

unsettling ‎(comparative more unsettling, superlative most unsettling)

That makes one troubled or uneasy

unsettling

unsettling ‎(plural unsettlings)

The weakening of some previously established system or norm.
- 2013, Krishna Sen, ‎Maila Stivens, Gender and Power in Affluent Asia (page 19)
  But reconstructing theory has proved more problematic than feminists might have hoped, even as their efforts played an important if sometimes overlooked part in post-modern unsettlings of theories in the West.