dis·cern·ment 
/dɪˈsɚnmənt/ noun
/dɪˈsɚnmənt/ noun [noncount] : the ability to see and understand people, things, or stituations clearly and intelligently
▪ His lack of discernment led to his disastrous choice of business partners.
▪ His lack of discernment led to his disastrous choice of business partners.
