IPA: /nɒŋˈɡrɛɡəriəs/
KK: /nɒŋˈɡrɛɡərɪəs/
Not inclined to socialize or be in groups; prefers to be alone.
He is quite nongregarious, often choosing to spend his weekends reading rather than attending parties.
Nongregarious → It is formed from "non-" (meaning not) and "gregarious" (from Latin "gregarius", meaning belonging to a flock or herd). The word describes someone who is not inclined to be sociable or to associate with others, hence not belonging to a group.
Think of 'non-' meaning not, and 'gregarious' relating to being part of a group. This helps you remember that 'nongregarious' refers to someone who is not social or does not like to be part of a crowd.