blithe (blīth, blīth)
adj. blith·er, blith·est
1. Carefree and lighthearted.
2. Lacking or showing a lack of due concern; casual: spoke with blithe ignorance of the true situation.
[Middle English, from Old English blīthe.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendicies
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.