Vincible ignorance is, in Catholic ethics, a moral or doctrinal matter that could have been removed by diligence reasonable to the circumstances. It contrasts with invincible ignorance, which can not be removed at all, or only by supererogatory efforts (e.g. exceptionally remote location).
While invincible ignorance prevents a sinful action from being a sin, vincible ignorance at most mitigates it. It may even aggravate guilt. The guilt of an act performed or omitted in vincible ignorance is not to be measured by the intrinsic malice of the thing done or omitted so much as by the degree of negligence discernible in the act.
Ignorance stemming from making little or no effort is termed crass or supine; it removes little or no guilt. Deliberately fostered ignorance is affected or studied; it can increase guilt.
Ignorance may be
Vincible ignorance can also refer to the intentional refusal to understand or consider a particular point of doctrine.
This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed (1913). Catholic Encyclopedia. Robert Appleton Company.