Somewhat flat; having qualities that are moderately or partially flat rather than extremely flat.
From 'flat' + '-ish' (a suffix meaning 'somewhat' or 'somewhat like,' as in 'reddish,' 'foolish,' or 'youngish').
The '-ish' suffix is wonderfully vague—it lets you describe something that doesn't fit cleanly into categories, which is why people say things like 'medium-flattish' to capture in-between qualities!
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