Somewhat dim; slightly dark or unclear, though not entirely obscure or bright.
From dim + -ish (suffix meaning 'somewhat' or 'rather'). The -ish suffix creates a gentler, less absolute version of the original adjective.
The -ish suffix is wonderfully efficient—'dimmish' means you don't want to commit to calling something truly 'dim,' just 'sort of dim,' which is exactly how English handles uncertainty and gradation.
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