sturdy

(s) 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
hardy, stalwart, stout,
(a) not making concessions
- took an uncompromising stance in the peace talks
- uncompromising honesty
uncompromising, inflexible,
(s) substantially made or constructed
- sturdy steel shelves
- sturdy canvas
- a tough all-weather fabric
- some plastics are as tough as metal
tough,

hardy stalwart stout uncompromising inflexible tough

compromising conciliatory flexible