nonformal
/ˈnɒnfɔrməl/Definitions
1. adjective
not part of a formal organization or system
“The nonformal education program was set up to support local communities.”
2. noun
an informal educational program or setting
“The nonformal education program provided valuable skills to the participants.”
3. adverb
in an informal or unofficial manner
“She approached the manager nonformally to discuss her concerns.”