1. To suggest or hint slyly
2. To instill or infuse subtly or artfully, as into the mind 3. To bring or introduce into a position or relation by indirect or artful methods
Premature insinuation is to give away or hint at something to early on, before you have the slightest proof or even know that what you are insinuating is the slightest bit true.
Detective Walsh: Virgo wasn't the one backing the money, now was he?
In`sa*lu"bri*ous\, a. Pref. in- not + salubrious: cf. L. insalubris, F. insalubre. Not salubrious or healthful; unwholesome; as, an insalubrious air or climate.