underdeveloped

American  

[uhn-der-di-vel-uhpt] / ˌʌn dər dɪˈvɛl əpt /

adjective

1. improperly or insufficiently developed.

2. Photography. (of a negative) less developed than is normal, so as to produce a relatively dark positive lacking in contrast.

3. developing.

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underdeveloped British  

/ ˌʌndədɪˈvɛləpt /

adjective

1. immature or undersized

2. relating to societies in which both the surplus capital and the social organization necessary to advance are lacking

3. photog (of a film, plate, or print) processed in developer for less than the required time, thus lacking in contrast

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Etymology

Origin of underdeveloped

First recorded in 1890–95; under- + develop + -ed ²

Example Sentences

It only takes one attention-grabbing and theologically underdeveloped topic for these competing incentives to create drama.

From Slate • Jun. 8, 2026

It can however be fatal to infants with underdeveloped immune systems.

From BBC • Apr. 1, 2026

While much of “Fatherland” feels underdeveloped, it is to Ms. Shorr’s credit that she has let Martin remain a disturbing enigma.

From The Wall Street Journal • Mar. 26, 2026

According to her Instagram post, Phillips was born with an underdeveloped kidney.

From Los Angeles Times • Feb. 11, 2026

“We think it’s possible that it’s underdeveloped, like an infant’s.”

From "Everything, Everything" by Nicola Yoon

Related Words

• embryonic
• nascent
• undeveloped