Etymology
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leaky (adj.)

mid-15c., from leak (n.) + -y (2). Related: Leakiness. Slang sense of "unable to keep a secret" attested from 1704.

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Definitions of leaky

leaky (adj.)
prone to communicate confidential information;
Synonyms: blabbermouthed / talebearing / tattling
leaky (adj.)
permitting the unwanted passage of fluids or gases;
a leaky roof
a leaky defense system
leaky (adj.)
used informally; unable to retain urine;
From wordnet.princeton.edu