In terms of intelligence:
* Stupid: This is the most direct opposite, meaning lacking intelligence or understanding.
* Dumb: Similar to stupid, but often considered more informal.
* Ignorant: Lacking knowledge or information.
* Unintelligent: Simply the lack of intelligence.
* Naive: Lacking experience or wisdom.
* Foolish: Acting without thinking or planning.
In terms of appearance:
* Unstylish: Lacking a sense of fashion or good taste.
* Sloppy: Messy or untidy.
* Unkempt: Not well-groomed or maintained.
* Drab: Lacking color or brightness.
In terms of behavior:
* Clumsy: Awkward or lacking grace.
* Uncoordinated: Unable to move smoothly and efficiently.
* Inept: Lacking skill or ability.
* Stupid: Acting in a way that is foolish or lacking in intelligence.
It's important to choose the word that best fits the specific situation and the intended meaning.