Here's the breakdown:
* Seeds: Seeds are often associated with decay and spoilage. They can become moldy, rotten, or infested with insects. This association with decay and deterioration is likely the root of "seedy."
* Early Usage: The word "seedy" first appeared in the late 18th century, referring to something "resembling or suggestive of seeds." This early usage still carried the connotation of something unwholesome or decayed.
* Figurative Meaning: Over time, the meaning of "seedy" evolved to describe people or places that were associated with decay, decline, or low morals. It became used to describe rundown neighborhoods, shabby individuals, and morally questionable activities.
So, while the exact origin is unclear, the connection to seeds and their association with decay and deterioration is the most likely explanation for the word's meaning.