excessively communicative:
reserved,
uncommunicative,
quiet,
silent,
untalkative.
noun:
indrawn,
shy,
withdrawn,
inhibited,
introverted,
incommunicative,
quiet,
tongue-tied,
Nonvocal,
discreet,
evasive,
aloof,
secretive,
self-contained,
closemouthed,
retiring,
laconic.
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