IPA: /ˌdɪsəˌprəˈbeɪʃən/
KK: /dɪsˌæprəˈbeɪʃən/
A strong feeling of disapproval or condemnation, often related to moral issues.
The teacher expressed her disapprobation of the student's behavior during class.
Disapprobation is formed from "dis-" (meaning apart or away) and "approbation" (from Latin "approbatio", meaning approval). The word describes the act of expressing disapproval or rejecting approval.
Think of 'dis-' meaning 'apart' and 'approbation' meaning 'approval' — disapprobation is when you are expressing that you are apart from approval.