Anti-design
Breaking design rules on purpose: clashing type, off-grid layouts, ugly color, elements that look broken but were placed that way.
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What it is
Anti-design breaks the rules on purpose and expects you to notice. Too many typefaces at once, stretched or squashed letterforms, colors that fight, elements parked off the grid, overlapping blocks, system-default fonts sitting next to an expensive display face. It descends from Italian Radical Design of the 1960s and 70s (Superstudio, Archizoom, and later Sottsass with Memphis), which treated 'good taste' as a commercial default worth attacking.
It is close to web brutalism but not the same move: brutalism strips styling away until raw structure shows, anti-design adds the wrong styling deliberately. Use it where looking like a SaaS template would be fatal: fashion, record labels, galleries, festivals, youth brands, portfolio sites that need to be remembered.
Gotcha: it only reads as intentional if the craft underneath is visible. One wrong move repeated with discipline (every heading misaligned by the same 14px, one clashing color used consistently) becomes a system; twelve random wrong moves become a bad page. Ugly is a style, unusable is a bug, so hold the line on contrast ratios, tap target size, and focus states even while everything else misbehaves.
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Design this as anti-design: deliberately break the rules while keeping it usable. Mix three or four clashing typefaces (a system default, a loud display face, a condensed sans), and use a color pairing that should not work (acid green on maroon, beige on hot pink). Lay everything out on a real 12 column grid, then break exactly one or two rules against it and break them the same way every time: every heading shoved 14px past its column edge, or one block overlapping the next by the same amount down the page. Everything else stays aligned, so the breaks read as a decision. Keep body text on a readable measure with accessible contrast, tap targets at least 44px, focus states visible, and one obvious path from the top of the page to the main action.