'Regressive' definitions:

Definition of 'regressive'

(from WordNet)
adjective
(of taxes) adjusted so that the rate decreases as the amount of income increases [ant: progressive]
adjective
Opposing progress; returning to a former less advanced state [ant: progressive]

Definition of 'Regressive'

From: GCIDE
  • Regressive \Re*gress"ive\ (r?*gr?s"?v), a. [Cf. F. r['e]gressif.] [1913 Webster]
  • 1. Passing back; returning. [1913 Webster]
  • 2. Characterized by retrogression; retrogressive. [1913 Webster]
  • Regressive metamorphism. (a) (Biol.) See Retrogression. (b) (Physiol.) See Katabolism. [1913 Webster]