(idiom) unchanging and rigid; used to describe something that remains fixed or someone who stubbornly follows old routines without adapting to new situations

(idiom) to deal with constantly shifting circumstances or a complex situation by adhering to a fixed core principle or policy

unchanging since times immemorial; unalterable or unvarying over a long period of many centuries; monotonous

invariant quantity; an unchanging property or value in mathematics and physics

(economics) constant or fixed capital; the portion of capital invested in production means such as machinery and raw materials that does not change its value during the production process

fixed price or constant price; the average price of products from a specific base period used as a standard to calculate and compare total industrial and agricultural output across different years

to show no sign of change in facial expression or attitude, especially when facing danger or difficult circumstances; to be calm and collected