Resembling or relating to a bank; having the characteristics or nature of a bank (either financial or geographical).
From 'bank' with the diminutive or descriptive suffix '-y', which transforms nouns into adjectives. This informal adjective formation reflects English's productive suffix system for creating informal descriptive terms.
The suffix '-y' is one of English's most playful grammatical tools—'banky' feels familiar because we use the same pattern for 'murky,' 'chunky,' and 'risky,' making it instantly understandable even if it's not in standard dictionaries.
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