adjustable
adj.adj. something you can change or move so that it fits better or works the way you want. You use this to describe things like chairs or tools that have different settings.
adj. capable of being altered or moved to achieve a desired fit, position, or level of performance. Often modified by degree adverbs such as 'fully' or 'easily'.
The height of this office chair is adjustable.
Most modern car seats are fully adjustable to ensure the driver remains comfortable during long journeys.
The telescope features an adjustable lens mount, allowing astronomers to fine-tune the focus with extreme precision regardless of atmospheric conditions.
From adjust + -able.
Typically used as a predicative adjective after a linking verb or as an attributive adjective before a noun.