"sturdiest" in the adjective sense
1. hardy, stalwart, stout, sturdy
having rugged physical strength inured to fatigue or hardships
"hardy explorers of northern Canada"
"proud of her tall stalwart son"
"stout seamen"
"sturdy young athletes"
2. uncompromising, sturdy, inflexible
not making concessions
"took an uncompromising stance in the peace talks"
"uncompromising honesty"
3. sturdy, tough
substantially made or constructed
"sturdy steel shelves"
"sturdy canvas"
"a tough all-weather fabric"
"some plastics are as tough as metal"
Source: WordNet® (An amazing lexical database of English)
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