8 letters · 10 points in Scrabble
adjective not firm or firmly fixed; likely to fail or give way
adjective lacking in security or safety
adjective lacking self-confidence or assurance
originFrom in- + secure, or from Medieval Latin insēcūrus, itself from in- (“in-, un-, non-”) + sēcūrus (“safe, certain”). Piecewise doublet of unsecure and unsure.
Etymology from Wiktionary, CC BY-SA 3.0