self-revealing
Concise Oxford English Dictionary © 2008 Oxford University Press:
self-revealing/sɛlfrɪˈviːlɪŋ/
▶adjective revealing one's character or motives, especially inadvertently.
– derivatives
self-revelation noun,
self-revelatory adjective.
self-revelation noun,
self-revelatory adjective.
'self-revealing' also found in these Oxford entries:

