treasonable

Men nudged their neighbours; some looked frightened and some grinned at the treasonable words.

Complaint was immediately made to the Parliamentary Committee of Examination that it contained treasonable and scandalous matter.

In other words, he had cast her horoscope, a proceeding common enough in those days, and one which had no treasonable complexion.

The caballing for dissolution of the Union, why should that be treasonable?

For those purposes a treasonable book against the King's right to the Crown was 'divulged.'