malevolent (adj.)

• acrid
• antagonistic
• antipathetic
• bad
• baleful
• baneful
• belligerent
• bitchy
• bitter
• black
• caustic
• clashing
• conflicting
• corrosive
• corrupting
• corruptive
• counterproductive
• criminal
• damaging
• deadly
• deleterious
• despiteful
• detrimental
• disadvantageous
• distressing
• evil
• harmful
• hateful
• hostile
• hurtful
• ill
• ill-affected
• ill-natured
• improper
• inaccurate
• inauspicious
• inexpedient
• inferior
• injurious
• invalid
• lethal
• malefic
• maleficent
• malicious
• malign
• malignant
• mischievous
• noisome
• noxious
• ominous
• peccant
• pernicious
• poisonous
• prejudicial
• quarrelsome
• rancorous
• repugnant
• sinful
• sinister
• sore
• spiteful
• toxic
• unfavorable
• unhealthy
• unkind
• unpleasant
• unskillful
• untoward
• venomous
• vicious
• virulent
• vitriolic
• wicked
• wrong