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Five clusters of extroversion words.
| No. | Cluster name | Members of cluster |
| 1 | Enthusiasm | Talkative – silent; enthusiastic – cool; confident – shy |
| 2 | Prosociality1 | Quiet – noisy; gregarious – solitary |
| 3 | Energy | Vigorous – tired; active – inactive |
| 4 | Arbitrariness | Decisive – hesitating; dominating – submissive; democratic – bossy |
| 5 | Sensation-seeking | Adventurous – surefooted; radical – conservative; brave – timid |
1In this article, being close to social groups was defined as prosociality here.
