redlich
honest
The quality of acting honestly, fairly, and decently. It describes a person or behavior that is morally beyond reproach.
Er hat sich sein Vermögen auf redliche Weise erarbeitet.
He earned his fortune in an honest way.

honest / decent
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honest
The quality of acting honestly, fairly, and decently. It describes a person or behavior that is morally beyond reproach.
Er hat sich sein Vermögen auf redliche Weise erarbeitet.
He earned his fortune in an honest way.

The word 'redlich' (honest, decent) is related to 'die Rede' (speech). It describes a person who can stand by their actions and give an account of them ('Rede und Antwort stehen' — to answer for oneself).
Ein redlicher Kaufmann betrügt seine Kunden nicht.
An honest merchant does not cheat his customers.
'Redlich' (honest, decent) belongs to elevated or formal language in both meanings. It is rarely used in everyday conversation.
Der Finder des Portemonnaies war eine redliche Seele und gab es bei der Polizei ab.
The person who found the wallet was an honest soul and handed it in to the police.
In the meaning of 'ehrlich' (honest), 'redlich' (honestly) is often used as an adverb to describe an action. Typical phrases are 'sich redlich bemühen' (to make an honest effort) or 'etwas redlich verdienen' (to honestly earn something).
Sie hat sich ihr ganzes Leben lang redlich bemüht, eine gute Mutter zu sein.
She made an honest effort her whole life to be a good mother.
You can recognize the meaning 'ziemlich' (quite) or 'ordentlich' (proper, considerable) by the fact that 'redlich' comes before a noun that describes an amount or a result. It often carries the connotation that one has earned something.
Nach der Gartenarbeit hatte er einen redlichen Durst.
After the gardening, he had worked up quite a thirst.
very
'sehr' and 'redlich' can both intensify something, but they are not used in the same way. 'sehr' is the normal word when you want to make an adjective, adverb, or sometimes even a verb stronger. 'redlich' as an intensifier sounds elevated, old-fashioned, or somewhat literary. You hear it only in certain expressions, for example when someone is 'redlich müde' (properly tired) or 'sich redlich bemüht' (makes an honest / serious effort). In everyday language, 'sehr' is almost always more natural. You would choose 'redlich' more deliberately when the sentence is allowed to sound a bit more special or old-fashioned.

Nach der langen Wanderung waren die Gäste redlich müde.
After the long hike, the guests were properly tired.
Nach dem Training war der Arzt sehr zufrieden mit meinem Knie.
After the training session, the doctor was very pleased with my knee.