Irresolute, a.
Etymology: [Pref. ir- not + resolute: cf. F. irrésolu, L. irresolutus not loosened.]
Not resolute; not decided or determined; wavering; given to doubt or irresolution. Weak and irresolute is man. Cowper.
Syn. -- Wavering; vacillating; undetermined; undecided; unsettled; fickle; changeable; inconstant. -- Ir*res"o*lute*ly, adv. -- Ir*res"o*lute*ness, n.
Shades of meaning
Fernald has no entry of its own for irresolute; he lists it under faint.
Where he writes about it:
A person may be faint when physically wearied, or when overcome with fear; he may be a faint adherent because naturally feeble or purposeless, or because half-hearted in the cause; he may be a faltering supporter because naturally irresolute or because faint-hearted and timid in view of perils that threaten, a listless worker, through want of mental energy and purpose. — from faint