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Meaning:
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not safe; not providing good support; not to be relied on

uncertain, worried

afraid anxious apprehensive hesitant shaky touchy troubled unsure uptight Delphic choked diffident hanging by thread jumpy on thin ice questioning touch and go unassured unconfident unpoised up in the air vague
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Cases of word usage

1) of rock, full of rocks; hard like rock; unstable; insecure (rocky)

INSECURE as in Wiktionary
INSECURE as in Wikipedia