1.  conscientiousness(n = noun.attribute) - the quality of being in accord with the dictates of conscience;
is a kind of conscience
has particulars: religiousness
Antonym: unconscientiousness
Derived form adjective conscientious₂

2.  conscientiousness(n = noun.attribute) painstakingness - the trait of being painstaking and careful;
is a kind of carefulness
has particulars: meticulosity, meticulousness, punctiliousness, scrupulousness, thoroughness, diligence, strictness, stringency
Antonym: unconscientiousness
Derived form adjective conscientious₁

   The quality of being conscientious; a scrupulous regard to the dictates of conscience. [1913 Webster]

N  duty, what ought to be done, moral obligation, accountableness, liability, onus, responsibility, bounden duty, imperative duty, call, call of duty, accountability, allegiance, fealty, tie engagement, part, function, calling, morality, morals, decalogue, case of conscience, conscientiousness, conscience, inward monitor, still small voice within, sense of duty, tender conscience, superego, the hell within, dueness, propriety, fitness, seemliness, amenability, decorum, to prepon, the thing, the proper thing, the right thing to do, the proper thing to do, ethics, ethology, deontology, aretology, moral philosophy, ethical philosophy, casuistry, polity, observance, fulfillment, discharge, performance, acquittal, satisfaction, redemption, good behavior, obligatory, binding, imperative, peremptory, stringent, behooving, incumbent on, chargeable on, under obligation, obliged by, bound by, tied by, saddled with, due to, beholden to, bound to, indebted to, tied down, compromised, in duty bound, amenable, liable, accountable, responsible, answerable, right, meet, moral, ethical, casuistical, conscientious, ethological, with a safe conscience, as in duty, bound, on one's own responsibility, at one's own risk, suo periculo, in foro conscientiae, quamdiu se bene gesserit, dura lex sed lex, dulce et decorum est pro patria mori, honos habet onus, leve fit quod bene fertur onus, loyaute m'oblige, simple duty bath no place for fear, stern daughter of the voice of God, there is a higher law than the Constitution.