IPA: /nɒnˈpræktɪsɪŋ/
KK: /nɑnˈpræktɪsɪŋ/
A person who is not actively engaged in a profession or does not follow the practices of a particular religion.
She is a nonpracticing lawyer who has chosen a different career path.
Nonpracticing → It is formed from "non-" (meaning not) and "practicing" (from Latin "practicare", meaning to do or perform). The word "nonpracticing" means not engaging in a particular practice or activity.
Think of 'not' ('non-') doing something 'actively' ('practicing') — that's why nonpracticing means not actively participating.