adj. stur·di·er, stur·di·est
1. Having or showing rugged physical strength or robust health: a sturdy lifeguard; a sturdy build.
2. Substantially made or built; able to withstand stress or rough use: a sturdy ladder; sturdy boots.
3. Marked by resoluteness or determination; firm: sturdy resistance.
[Middle English, fierce, valiant, disobedient, strong, from Old French estourdi, dazed, reckless, from past participle of estourdir, to stun, perhaps from Vulgar Latin *exturdīre, to be or act drunk like a thrush that has eaten fermented grapes or berries : Latin ex-, intensive pref.; see EX- + Latin turdus, thrush.]
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.