perturbative: Meaning and Definition of

per•tur•ba•tive

Pronunciation: (pûr'tur-bā"tiv, pur-tûr'bu-tiv), [key]
— adj.
  1. having a tendency to perturb; disturbing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.