Troubled by doubts or pangs of conscience; (excessively) conscientious. Also: giving rise to doubt or uncertainty. Cf. scrupulous, adj. 1 2, scriple…

Excessively scrupulous.

figurative. Of persons, their habits, opinions, etc.: Excessively rigid or scrupulous in matters of conduct; narrow or over-precise in one's rules…

Performed according to conscience; scrupulous. Cf. conscientious, adj. 1. Obsolete except as merged with sense 4.

Sensitively or excessively fastidious, scrupulous, particular, or punctilious, with regard to standards of action or belief.

having a delicate or tender conscience.

(attributive)

Of actions, etc.: Rigidly directed by the dictates of conscience; characterized by a strict and minute regard for what is right.

Overscrupulous. rare.