(as|) useful as a chocolate teapot

completely useless or ineffective for its intended purpose

The idiom "useful as a chocolate teapot" is a humorous phrase that originated from the concept of a teapot made of chocolate, which would quickly melt when exposed to hot liquids. The idiom is used to describe something or someone that is utterly ineffective, futile, or impractical. It emphasizes the complete lack of usefulness or functionality, comparing it to an object that serves no purpose due to its inherent limitations.

His suggestion to bring a ladder to fix the roof was as useful as a chocolate teapot since the ladder was too short to reach.
The outdated software provided by the company was as useful as a chocolate teapot for completing the project on time.
Offering him advice on repairing cars is as useful as a chocolate teapot since he knows nothing about automobiles.
The broken compass in their survival kit was as useful as a chocolate teapot when they were lost in the wilderness.
The meeting without an agenda or clear objectives was as useful as a chocolate teapot, wasting everyone's time.