Somewhat inclined to flirt; having qualities reminiscent of flirting.
From 'flirt' plus the suffix '-ish' (from Old English 'isc'), which softens meanings by suggesting 'somewhat' or 'resembling' rather than being fully that thing.
The '-ish' suffix is a genius feature of English—it lets you hedge and qualify almost anything: 'youngish' means sort of young, 'bluish' means sort of blue, and 'flirtish' means sort of flirty without committing fully to the description.
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