a. Sluggish, lethargic, or inactive: "It is a man's own fault, it is from want of use, if his mind grows torpid in old age" (Samuel Johnson).
b. Showing little interest; apathetic: a torpid audience.
2. Conducive to sluggishness or inactivity, especially in being warm and humid: a torpid summer evening.
3. Dormant; hibernating.
[Latin torpidus, numbed, paralyzed, from torpēre, to be stiff; see ster-1 in the Appendix of Indo-European roots.]
tor·pidi·ty (-ĭ-tē) adv.
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 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.