More candid; more frank, honest, and straightforward in speech or manner.
Comparative form of 'candid,' from Latin 'candidus' (white, pure), originally meaning 'pure-white' and metaphorically 'pure in heart' or 'honest.' The shift to 'frank and honest' developed through the idea that purity suggests truthfulness.
The word 'candid' comes from the Latin for 'white'—Romans believed that an honest person had a 'white' or pure heart, which is why candid camera photos are so called: they catch the 'pure' truth without posing.
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