The phrase "add the subtle" is grammatically correct and can be used in written English.
It can be used when discussing the incorporation of nuanced or delicate elements into a piece of work, such as writing, art, or design.
Example: "To enhance the overall impact of the story, the author decided to add the subtle hints of irony throughout the narrative."
Alternatives: "incorporate the nuances" or "include the delicate details".
Her 2011 collection of Rossini arias showed soprano Julia Lezhneva to be a singer of uncommon ability and vivacity, to which this Decca debut of baroque motets adds the subtler qualities of generosity and devotion.
"King Kong," written by Jack Thorne and directed and choreographed by Drew McOnie (now playing at the Broadway Theatre, with songs by Eddie Perfect and a score by Marius de Vries), adds the subtlest tweak, accomplished solely through casting, to the story: Ann Darrow, the damsel, is black.
It is then up to Mr. Street, a talented sculptor, to add the details and subtle differences that breathe life into the copy.
Worcestershire sauce is a must, but I can do without Tabasco and cayenne pepper: the mustard adds all the subtle heat the dish needs.
An additional layer of complexity is added by the subtle differences in function of the different subtypes of type I IFN and the difficulty to directly measure these individual isoforms.
23 Our study adds the knowledge that subtle individual differences in fluid cognitive ability largely influence age-related differences in the literacy skills required to self-manage health among older adults.
Toby Morris, a cartoonist and illustrator writing at Radio New Zealand, mourned the panel's decision to overlook his personal favorite design, "Red Peak". The design was "Simple, strong, [and] distinctive," he wrote, adding: "The colours give a subtle nod to the old flag but look distinctly New Zealand.
Phil Rosenthal of the Los Angeles Daily News called the episode a "wonderful stab" at American politics and the "media machine that drives it", and added: "The message is so subtle, the makers of The Simpsons might deny it is there at all for fear of turning off a portion of its audience.
Add to this the subtle effects of technology.
The second half of the track is barely altered other than to add a subtle boost in the kick's low end, and to add a delayed clap.
