adj. un·health·i·er, un·health·i·est
a. Being in a state of ill health; sick.
b. Characterized by or symptomatic of ill health: an unhealthy pallor.
c. Causing or conducive to poor health; unwholesome: an unhealthy diet.
2. Harmful to character or morality; corruptive: unhealthy reading material.
3. Characterized by or symptomatic of disturbed mental health: took an unhealthy interest in violence and fires.
4. Of a risky nature; dangerous: an unhealthy predicament.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.