Meaning

adjective full of seeds

adjective shabby and untidy; ; - Mark Twain

adjective somewhat ill or prone to illness

originFrom Middle English sedy, equivalent to seed + -y. The senses with negative connotation, first attested by 1725 in slang, originally especially “poor, out of money”, probably arose from the metaphor of a flower that has gone to seed, and is no longer considered beautiful. From there the word came to be used to describe unwell or past-their-prime people, and parallelly run-down places and by…

Etymology from Wiktionary, CC BY-SA 3.0