from the GNU version of the Collaborative International Dictionary of English
- adj. any improper or wrongful constraint, machination, or urgency of persuasion, by which one's will is overcome and he is induced to do or forbear an act which he would not do, or would do, if left to act freely.
Sorry, no etymologies found.
Reasons of state and court etiquette required the Duchess of Kent to retire from the constant companionship of her daughter, lest she should be suspected of undue influence over her.
To Reed this was just another proof of loose morals, flagging patriotism, and the undue influence of Morris, Deane’s friend and collaborator.
Henri III, exasperated by the departure of the three Princes, declared his determination to revenge the affront upon Marguerite, who had not been enabled to accompany her husband; but the representations of the Queen-mother induced him to forego this ungenerous project, and he was driven to satiate his thirst for vengeance upon her favourite attendant, Mademoiselle de Torigni,  of whose services he had already deprived her, on the pretext that so young a Princess should not be permitted to retain about her person such persons as were likely to exert an undue influence over her mind, and to possess themselves of her secrets.
In return for Innocent's support, Frederick had been obliged to make promises to the pope at Eger (12 July, 1215), which would put an end to the undue influence of the civil power over the German bishops.