undersized

Tiny is a related term of undersized.

As adjectives the difference between tiny and undersized

is that tiny is very small while undersized is below the usual or expected size.

As a noun tiny

is a small child; an infant.

Miniature is a related term of undersized.

As adjectives the difference between miniature and undersized

is that miniature is smaller than normal while undersized is below the usual or expected size.

As a noun miniature

is greatly diminished size or form; reduced scale.

As a verb miniature

is to make smaller than normal; to reproduce in miniature.

Undersized is a related term of elfin.

As adjectives the difference between undersized and elfin

is that undersized is below the usual or expected size while elfin is relating to or resembling an elf, especially in its tiny size or features.

As a noun elfin is

an elf; an inhabitant of fairy-land.

Dwarf is a related term of undersized.

As adjectives the difference between dwarf and undersized

is that dwarf is while undersized is below the usual or expected size.

As a noun dwarf

is (mythology) any member of a race of beings from (especially scandinavian and other germanic) folklore, usually depicted as having some sort of supernatural powers and being skilled in crafting and metalworking, often depicted as short, and sometimes depicted as clashing with elves.

As a verb dwarf

is to render (much) smaller, turn into a dwarf (version).

Dwarfish is a related term of undersized.

As adjectives the difference between dwarfish and undersized

is that dwarfish is like a dwarf; being especially small while undersized is below the usual or expected size.

Pygmy is a synonym of undersized.

As adjectives the difference between pygmy and undersized

is that pygmy is relating or belonging to the pygmy people while undersized is below the usual or expected size.

As a noun pygmy

is (often capitalized, usually in the plural: pygmies ) a member of one of various ancient equatorial african tribal peoples, notable for their very short stature.

Midget is a related term of undersized.

As a noun midget

is (originally) a little sandfly.

As an adjective undersized is

below the usual or expected size.

As adjectives the difference between compact and undersized

is that compact is closely packed, ie packing much in a small space while undersized is below the usual or expected size.

As a noun compact

is an agreement or contract or compact can be a small, slim folding case, often featuring a mirror, powder and a powderpuff; that fits into a woman's purse or handbag, or that slips into ones pocket.

As a verb compact

is to make more dense; to compress.