uncontrolled

adjective

un·​con·​trolled ˌən-kən-ˈtrōld 

: not controlled: such as

a

: happening or done without being stopped, slowed, or controlled

an uncontrolled tantrum

his uncontrolled anger

uncontrolled hypertension

uncontrolled urban sprawl

b

: not conducted or maintained in accordance with fixed rules, restraints, or procedures

results from an uncontrolled study

c

: not regulated by law with regard to possession and use

uncontrolled substances

Synonyms of uncontrolled

• rampant
• runaway

Examples of uncontrolled in a Sentence

a tirade filled with uncontrolled anger about what the government was doing

Recent Examples on the Web

In Cambridge, the study found that the city’s previous rent control policy caused property values to drop between 45% and 50% compared to nearby uncontrolled properties. —Tim Dunn, Boston Herald, 4 June 2026

Safety and efficacy have not been evaluated in pregnant women, pediatric users, people with active cancer or cancer in remission, or users with uncontrolled hypertension, hypotension, bradycardia or tachycardia. —Samantha Agate, Sacbee.com, 3 June 2026

Well, maybe, but on the other hand, a massive uncontrolled experiment on a global scale that can impact mental health might not be the best course of action for humankind. —Lance Eliot, Forbes.com, 31 May 2026

An investigation is required after the Super Heavy booster experienced a performance failure and an uncontrolled landing. —Eric Lagatta, USA Today, 28 May 2026

Word History

First Known Use

circa 1535, in the meaning defined above

Rhymes for uncontrolled

• ahold
• behold
• billfold
• blindfold
• cajoled
• consoled
• controlled
• cotswold
• eightfold
• enfold
• enrolled
• extolled

Medical Definition

uncontrolled

adjective

un·​con·​trolled ˌən-kən-ˈtrōld 

1

: not being under control

uncontrolled hypertension

2

: not incorporating suitable experimental controls

uncontrolled drug trials