All 4 Uses

candid
in
Pride and Prejudice
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Affectation of candour is common enough—one meets with it everywhere.†
p. 16.9 *

candour = honesty and directness

unconventional spelling: This is a British spelling. Americans use candor.
But to be candid without ostentation or design—to take the good of everybody's character and make it still better, and say nothing of the bad—belongs to you alone.†
p. 17.1
Miss Bennet was the only creature who could suppose there might be any extenuating circumstances in the case, unknown to the society of Hertfordshire; her mild and steady candour always pleaded for allowances, and urged the possibility of mistakes—but by everybody else Mr. Darcy was condemned as the worst of men.†
p. 136.6

candour = honesty and directness

unconventional spelling: This is a British spelling. Americans use candor.
who have often disdained the generous candour of my sister, and gratified my vanity in useless or blameable mistrust!†
p. 202.1

Definitions:

(1) (candid as in: your candid opinion)
honest and direct
(2) (candid as in: a candid photograph)
unposed -- typically said of a photograph
(3) (meaning too rare to warrant focus)