unavowable

The love of love itself has concealed a far more awful passion, a desire altogether unavowable, something that could only be ‘betrayed’ by means of symbols such as that of the drawn sword and that of perilous chastity.

The Vivisection of Bone, Part 1: Romancing the Bone 2007

The curtains were drawn, and the warm friendly aspect of the room smote him like that of a familiar face met during an unavowable errand.

The Age of Innocence 1920

The curtains were drawn, and the warm friendly aspect of the room smote him like that of a familiar face met during an unavowable errand.

XXXII. Book II 1920

There was something unavowable, which he dared not tell his father.

Lady Molly of Scotland Yard 1912

He shuddered with an unavowable fear, then added more calmly:

Lady Molly of Scotland Yard 1912

Unfortunately, at one time, young Frewin had got into very bad company, made many debts, some of which were quite unavowable, and there were rumours current at the time to the effect that had the police got wind of certain transactions in connection with a brother officer's cheque, a very unpleasant prosecution would have followed.

Lady Molly of Scotland Yard 1912

"Well, now, tell me," he said, with that bland patience which had so oft served him in good stead in his unavowable profession.

The League of the Scarlet Pimpernel Emmuska Orczy Orczy 1906

They were, as it were, his subordinates; without their help he never could have carried on his unavowable profession quite so successfully.

The League of the Scarlet Pimpernel Emmuska Orczy Orczy 1906

Not a sound now disturbed the stillness of the night save when a bat fluttered overhead, or when furtive footsteps -- on unavowable errand bent -- glided softly off the beaten track and quickly died away among the shadows.

"Unto Caesar" Emmuska Orczy Orczy 1906

He could not keep his hands off her -- and it distressed and worried him whenever he saw anybody else doing quite innocently what he did with an unavowable purpose.

The Devil's Garden W. B. Maxwell 1902