The trait of being unwilling:
— His unwillingness to cooperate vetoed every proposal I made.

synoniem: involuntariness.

Roget 603: unwillingness etc. adj.; indisposition, indisposedness^†; disinclination, aversation^†; nolleity^†, nolition^†; renitence^†, renitency; reluctance; indifference etc. 866; backwardness etc. adj.; slowness etc. 275; want of alacrity, want of readiness; indocility etc. (obstinacy) 606^†.    scrupulousness, scrupulosity; qualms of conscience, twinge of conscience; delicacy, demur, scruple, qualm, shrinking, recoil; hesitation etc. (irresolution) 605; fastidiousness etc. 868.    averseness etc. (dislike) 867^†; dissent etc. 489; refusal etc. 764.    ... meer laten zien

Nederlands: onwil
Pools: oporność, niechęć