be (one's) own worst enemy

To do things that complicate one's life and/or keep one from success; to be self-destructive or self-sabotaging. Of course Tommy started skipping school again—he's his own worst enemy. She always sabotages a relationship when it's going really well because she's her own worst enemy.

Common Names:

Name	Pronounced	Usage
Jedidah	ji-DIE-də (English), jee-DIE-də (English)	Biblical
Deepak	-	Indian, Hindi, Marathi, Bengali, Gujarati, Punjabi, Malayalam, Kannada, Tamil, Telugu, Nepali
ÁStrÍ&Eth;Ur	-	Icelandic
Fabrice	fa-BREES	French
Niels (2)	NEELS	Dutch
AscensiÓN	ah-then-SYON (Spanish), ah-sen-SYON (Latin American Spanish)	Spanish