Simplicity and solidity; unadorned and substantial quality—often contrasted with showiness.
彼の作風は質実で無駄がない。
His style is simple and no-nonsense.
新しい家は外観は地味だが、内装は質実だ。
The new house looks plain on the outside, but the interior is solid and well-made.
質実剛健という言葉は、飾り気より実力を重んじる価値観を表す。
The phrase 'shitsu-jitsu-gou-ken' expresses valuing substance over ornament.