Resembling or characteristic of a chief; having qualities associated with leadership or authority.
Formed from 'chief' plus the suffix '-ish,' which creates adjectives meaning 'somewhat like' or 'having the quality of' (similar to 'devilish,' 'foolish,' 'prudish'). This is a rare or informal formation.
The '-ish' suffix is incredibly casual and productive—English speakers can add it to almost anything to make it sound somewhat like that thing, which is why 'chiefish' makes sense even though nobody uses it; it's always available when you need it.
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