plain and sturdy; simple and robust
Describes something that is both straightforward in design and physically or structurally strong. Often used for tools, furniture, or systems that prioritize function over decoration.
This desk has a plain and sturdy construction, so it will last a long time.
His proposal was simple and robust, and everyone was convinced.
簡素 means 'simple' or 'plain' without the nuance of strength; 簡明強固 adds the idea of being sturdy or robust.
頑丈 means 'sturdy' or 'solid' but does not imply simplicity; 簡明強固 combines both simplicity and sturdiness.
Compound of 簡明 (simple, plain) and 強固 (strong, sturdy). The exact historical derivation is uncertain, but the word is formed from standard Sino-Japanese morphemes.