adverse

Harmful or making success less likely.

• The medicine caused an adverse reaction.
• Adverse weather conditions delayed the flight.
• The changes may have adverse effects on small businesses.

How to use it: adverse effect on something (The delay had an adverse effect on sales.)

Similar words: harmful, unfavorable, negative

Opposites: favorable, beneficial

Common phrases: adverse effect, adverse conditions, adverse reaction, adverse circumstances

Facing something from the opposite side.

• A drawing appeared on the adverse page.
• The two adverse surfaces faced each other.
• She compared the text with the illustration on the adverse page.

Similar words: opposite, facing

Common phrases: adverse page, adverse side