Somewhat genteel, noble, or refined; having qualities somewhat similar to those of a gentile or person of good family.
From gentil plus the suffix -ish, which softens or makes something partially or somewhat what the root word means.
The suffix -ish is English's way of saying 'kind of' or 'sort of'—it's why something can be reddish (not quite red), foolish (kind of foolish), or gentilish (somewhat noble but not entirely).
Complete word intelligence in one call. Free tier — 50 lookups/day.