Seamless

[Raeanne Dimick]

[Seamless] (noun) - Used to describe a situation where everyone is told it will work [perfectly], when in fact its an [unmitigated clusterfuck].

[Cami]

(of a fabric or surface) smooth and without seams or obvious joins.

[Luis Fok]

without any seams (= lines of sewing joining different pieces of cloth) :

[Tanya Shivari]

To [composite] one or more [images] together using an imaging program (like [Photoshop]) so perfectly, it is difficult to tell the image is fake.