Suppressive \Sup*press"ive\, a. Tending to suppress; subduing; concealing. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

67 Moby Thesaurus words for "suppressive": absolute, absolutist, absolutistic, arbitrary, aristocratic, arrogant, authoritarian, authoritative, autocratic, bossy, choking, constraining, constrictive, contrary, counterproductive, crosswise, despotic, dictatorial, domineering, exclusive, feudal, forbidding, grinding, high-handed, hindering, hindersome, imperative, imperial, imperious, in the way, inhibiting, inhibitive, inhibitory, interdictive, interdictory, interrupting, interruptive, lordly, magisterial, magistral, masterful, monocratic, obstructing, obstructive, obstruent, occlusive, oppressive, overbearing, overruling, peremptory, preclusive, preventive, prohibiting, prohibitive, prohibitory, proscriptive, repressive, restraining, restrictive, severe, stifling, strangling, strict, stultifying, troublesome, tyrannical, tyrannous

Source: Moby Thesaurus II by Grady Ward, 1.0
 

suppressive adj : tending to suppress; "the government used suppressive measures to control the protest"

Source: WordNet (r) 2.0
 

Suppressive \Sup*press"ive\, a. Tending to suppress; subduing; concealing.

Source: Webster's Revised Unabridged Dictionary (1913)