adjective

reasonable

Translation

reasonable, fair, sensible, affordable

The price is quite reasonable.

She made a reasonable argument.

He is a reasonable person to deal with.

a reasonable ((noun)) a fair or sensible (noun) That's a reasonable price.

it is reasonable to ((do sth.)) it is fair or sensible to (do sth.) It is reasonable to ask for more time.

Synonyms: fair, sensible, logical; Antonyms: unreasonable, irrational

From 'reason' + the suffix '-able', meaning 'capable of'. So, 'capable of reason' or 'based on reason'.

If something has a good 'reason', it is 'reasonable'. The words are directly linked.