dummies
n. plural-only B2 Upper Intermediate US //ˈdəmiz// UK //dˈʌmɪz// dum·mies
n. people who are not very smart or who do not know much about a specific subject. It is also used for the life-sized dolls used in car safety tests or for showing clothes in shops.
n. individuals perceived as lacking intelligence or expertise in a particular area. Also refers to anatomical models used for medical training, garment display, or crash testing. Often used in the titles of instructional books to indicate a beginner-level guide.
This computer manual is written for dummies.
The researchers used crash test dummies to measure the impact of the collision on the human body.
Usage
As a plural noun referring to people, it is informal and can be mildly offensive; as a technical term for models, it is neutral.