The phrase "always functional" is correct and usable in written English.
It can be used to describe something that consistently works or operates as intended without failure.
Example: "The software is always functional, ensuring that users can rely on it for their daily tasks."
Alternatives: "consistently operational" or "perpetually effective".
But he was always functional, even though he was reportedly consuming as many as four pints of gin a day.
I can see Henderson's arguments for allowing a building like Smithfield General Market, which was always functional and not-too-precious, to evolve and change.
The film strips the subject of prurience, so it becomes like any addiction – an action that has moved from habit to horror; never pleasurable, always functional; a repetitive reaction to grief.
The judge reasoned that in fashion, color is always "functional" — meaning that color is a useful aesthetic feature to which all designers should have access.
Furniture is streamlined and contemporary, always functional and never gratuitous, like the steel-framed bunk beds in the hostel rooms and the small but smart dark wood desks and side tables in the hotel rooms.
Right now, Instagram's 100 million users are discovering that while pseudoanonymity can be fun, it's not always functional.
Specifically, the study moves beyond the assumption that rainwater systems are always operational and functional and draws on the collected data to explore the various reasons and rates of failure associated with pumps and pump switches, leaving for later further exploration of the failure in other components such as the collection area, gutters, tank, and overflows.
Further, sequence similarity does not always mean functional similarity and this may influence the interpretation of our results as minor sequence dissimilarities may represent functional different or even a completely new functions.
There would always be functional justifications for what often seem like purely visual features; in the case of the Pompidou Centre, it was apparently necessary to have the lifts, tanks, pipes and other services outside of the building to create the space for large, flexible rooms that could hold wide varieties of artworks.
Barriers mechanisms applied in railway have been used for several decades, having always ensuring functional safety.
New features are added to the software incrementally, and the software is always kept functional.
