unhealthy

adjective

un·​healthy ˌən-ˈhel-thē How to pronounce unhealthy (audio)
unhealthier; unhealthiest
Synonyms of unhealthynext
1
: not conducive to health : not healthful
an unhealthy climate
unhealthy habits
unhealthy foods
2
: not in good health : sickly, diseased
unhealthy animals
3
a
: risky, unsound
an unhealthy economy
b
: of a harmful nature : bad, injurious
unhealthy eating habits
unhealthy levels of lead
c
: involving or causing feelings or thoughts that are not normal and healthy
an unhealthy relationship
has an unhealthy interest in natural disasters
unhealthily adverb
unhealthiness noun

Examples of unhealthy in a Sentence

Her skin looks blotchy and unhealthy. Tests revealed an unhealthy level of lead in the water. Eating honey can be unhealthy for babies. He was stuck in an unhealthy relationship. She has an unhealthy interest in natural disasters.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
According to the Cleveland Clinic, a stem cell transplant can treat — and sometimes cure — certain blood disorders, cancers and autoimmune diseases by replacing unhealthy stem cells with healthy ones, either from the patient's own bone marrow or donated stem cells from another person. Tereza Shkurtaj, PEOPLE, 23 May 2026 There are aspects of relationships that can be abnormal or unhealthy. R. Eric Thomas, Chicago Tribune, 23 May 2026 Her boss is dangling a promotion in the hopes of stretching her 40-hour workweek to new, unhealthy limits. Ben Travers, IndieWire, 20 May 2026 The South Coast Air Quality Management District said the portions of Los Angeles, Riverside, San Bernardino and Ventura counties near the wildfires can reach levels that are unhealthy for sensitive groups by Tuesday night. Matthew Rodriguez, CBS News, 20 May 2026 See All Example Sentences for unhealthy

Word History

First Known Use

1595, in the meaning defined at sense 1

Time Traveler
The first known use of unhealthy was in 1595

Browse Nearby Words

Cite this Entry

“Unhealthy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unhealthy. Accessed 26 May. 2026.

Kids Definition

unhealthy

adjective
un·​healthy ˌən-ˈhel-thē How to pronounce unhealthy (audio)
1
: not conducive to good health : not healthful
an unhealthy climate
2
: not in good health : sickly, diseased
3
a
: risky, unsound
an unhealthy economy
b
unhealthily adverb
unhealthiness noun

Medical Definition

unhealthy

adjective
un·​healthy -ˈhel-thē How to pronounce unhealthy (audio)
unhealthier; unhealthiest
1
: not conducive to health
an unhealthy climate
2
: not in good health : sickly
unhealthiness noun

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