Protective

having the quality or function of protecting

a protective covering.

tending to protect.

Economics . of, pertaining to, or designed to favor protectionism

protective tariffs.

defensive ( def. 4 ) .

adjective

attacking , harmful , hurtful , injurious , threatening

adjective

careful , conservational , conservative , covering , custodial , defensive , emergency , guardian , insulating , jealous , possessive , preservative , protecting , safeguarding , sheltering , shielding , vigilant , warm , watchful , preventative , prophylactic