for (a/some) reason(s) best known to (oneself)

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for (a/some) reason(s) best known to (oneself)

For strange or perplexing reasons that the speaker cannot understand. For reasons best known to herself, Mom refuses to wear her glasses and goes around squinting at everything instead.
See also: known

for reasons best known to himself (or herself, etc.)

used when recounting someone's behaviour to suggest that it is puzzling or perverse. chiefly humorous
See also: himself, known, reason

for a/some reason/reasons best known to himˈself, herˈself, etc.

(humorous) for a reason or reasons which other people find hard to understand: For reasons best known to himself, he wears two pairs of socks.
See also: known, reason
References in classic literature ?
Whether I walked with the young ladies or rode with their parents, depended upon their own capricious will: if they chose to 'take' me, I went; if, for reasons best known to themselves, they chose to go alone, I took my seat in the carriage.
The question discomposed me, but I now felt plainly that my principal was endeavouring (for reasons best known to himself--at that time I could not fathom them) to excite ideas and wishes in my mind alien to what was right and honourable.
The rest of the boys, for reasons best known to themselves, though they loathed the master, took his side in the affair, and, to show their indignation that the school's business had been dealt with outside, made things as uncomfortable as they could for Walters' younger brother, who still remained.
He was in his shirt, which was not long enough in front to cover his thighs completely and was six fingers shorter behind; his legs were very long and lean, covered with hair, and anything but clean; on his head he had a little greasy red cap that belonged to the host, round his left arm he had rolled the blanket of the bed, to which Sancho, for reasons best known to himself, owed a grudge, and in his right hand he held his unsheathed sword, with which he was slashing about on all sides, uttering exclamations as if he were actually fighting some giant: and the best of it was his eyes were not open, for he was fast asleep, and dreaming that he was doing battle with the giant.
For reasons best known to herself, Marilla did not tell Anne that she was to stay at Green Gables until the next afternoon.
And indeed, Father Brown, for reasons best known to himself, had lingered much longer than politeness required; or even, in the ordinary sense, permitted.
At uncertain times he suffers from acute attacks of the fidgets or cramp in his legs, and though he is more virtuous to behold than any of the cranes, who are all immensely respectable, he flies off into wild, cripple-stilt war-dances, half opening his wings and bobbing his bald head up and down; while for reasons best known to himself he is very careful to time his worst attacks with his nastiest remarks.
For reasons best known to themselves, they are not aware of this development.
In other words, 13 million people, for reasons best known to themselves, didn't vote one way or the other.
But, Nana Marfo Panin II indicated that the allegations were devised by some unscrupulous people for reasons best known to them, and added that the chiefs and overlords of the area condemn such acts.
Moreover, when the petitioner had verified her results from the answer key, her marks came out to be more than 400 which have been mentioned as 334, for reasons best known to the Respondent.
'We can no longer tolerate the current status quo whereby the entire workers are stagnated without any form of promotion since the inception of the Teaching Hospital in 2012, for reasons best known to the Hospital Management.
However, for reasons best known to the group, they decided to pursue solo careers.
For reasons best known to themselves, some politicians and parts of the media prefer to pretend that these things never happened.
He said the millers would honour the agreement they had signed on April 2, however, some of the LQM leaders seemed to be doing politics on the issue for reasons best known to them.