• volitional, voluntary, willing
• contrary, crabby, headstrong, recalcitrant, stubborn, wayward, wilful, willful
• power of will, will-power, willpower
• accidental, involuntary, unwanted, unwitting
• by misadventure, involuntarily, unawares, unwittingly
• benevolence, benignity, friendliness, goodwill
• censoriousness, ill will, ill-will, malevolence, malice, malignancy, malignity, rancor, rancour, spite, spitefulness, viciousness
• hostile, malevolent, malignant, rancorous