Somewhat deep; moderately deep but not extremely so.
From 'deep' + '-ish' suffix (meaning 'somewhat' or 'rather'). The '-ish' suffix comes from Old English and creates casual, informal adjectives.
The '-ish' suffix is the lazy speaker's best friend—instead of precisely measuring depth, you can just say something is 'deepish' and everyone understands it's in-between shallow and deep.
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