usable

Capable of being used.

The late Professor Pat White was an outspoken critic. In his 1986 book Forgotten Railways, he dismissed as smoke and mirrors the oft-used argument that 33% of rail routes carried only 1% of the traffic, as it ignores the fact that a third of the national road network also only carried 2% of cars and lorries. But unlike rail, road got away with it because no mention was made of how much it cost the taxpayer to keep them usable.

Easy to use; exhibiting good usability.

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2019 episode 1 A Very English Scandal Are you telling me that you were useable?