Irresolution, n.
Etymology: [Cf. F. irrésolution.]
Want of resolution; want of decision in purpose; a fluctuation of mind, as in doubt, or between hope and fear; irresoluteness; indecision; vacillation. Irresolution on the schemes of life which offer themselves to our choice, and inconstancy in pursuing them, are the greatest causes of all unhappiness. Addison.
Shades of meaning
Fernald has no entry of its own for irresolution; he lists it under doubt.
Where he writes about it:
Misgiving is ordinarily in regard to the outcome of something already done or decided; hesitation, indecision, and irresolution have reference to something that remains to be decided or done, and are due oftener to infirmity of will than to lack of knowledge. — from doubt