Something that does not end, cannot be solved, or is incurable. Kadhal (காதல்): Romantic love.
In Tamil culture and literature, "Theeradha Kadhal" refers to a profound emotional state where love is considered "eternal" or "unquenchable."
Theeradha Kadhal - song and lyrics by John Robins ... - Spotify
The phrase is a popular title for various creative projects in India:
A notable short film titled Theeradha Kadhal was directed by Kovai Gurumoorthy , an alumnus of the South India Film Institute. It gained recognition at festivals like the Moonwhite Films International Film Fest for its portrayal of a man living in quiet harmony with the memory of his beloved.