Truthful, sincere (6)

I believe the answer is:

honest

I believe this clue is a double definition.

'truthful' is the first definition.
(similar in meaning)

'sincere' is the second definition.
(similar in meaning)

(Other definitions for honest that I've seen before include "Fair and free of deceit" , "Sincere, upright" , "Direct" , "Upright and straightforward" , "Law-abiding" .)

I've seen this clue in The Times.

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