The most suspicious, questionable, or smelling strongly of fish.
Superlative form of 'fishy,' formed with the '-est' suffix, indicating the greatest degree of the quality being suspicious or fish-like.
This superlative is commonly used in crime novels and detective shows—when something seems 'the fishiest,' it's the most obviously suspicious element, following the metaphorical journey of the word from literal smell to figurative deception.
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