Based on Attractiveness:
* Repulsive: This implies something is unpleasant or disgusting.
* Unattractive: This means lacking appeal or beauty.
* Off-putting: This suggests something is unpleasant or discouraging.
Based on Interest:
* Boring: This means lacking excitement or interest.
* Dull: This is similar to boring but suggests something is lifeless or uninspired.
* Uninteresting: This means not capturing the attention or curiosity.
Based on Desirability:
* Unwanted: This means not desired or requested.
* Undesirable: This suggests something is not worth having or pursuing.
* Repellent: This implies something strongly discourages or repels.
Other Opposites:
* Unconvincing: This means lacking the power to persuade or influence.
* Unpersuasive: This means not able to convince or persuade.
* Uncompelling: This means lacking the power to hold interest or attention.
The best opposite word for "appealing" will depend on the specific context and what aspect of "appealing" you want to express the opposite of.