caprice, impulse, whim
Meaning: a sudden desire; "he bought it on an impulse"
A wild caprice flashed into her brain.
If we do not know its end, we shall be at the mercy of accident and caprice.
His labor and his very life itself was subject to the greed, the passion and the caprice of his over-lord.
Naboth, and the miller of Sans-Souci, would have protested against French law, as they protested against the caprice of their kings.
That at any rate was now almost certain. Up to the present she had doubted, knowing the way in which such men will change their engagements at the least caprice.
Of course, this very stupid thing, this caprice of ours, may be in reality, gentlemen, more advantageous for us than anything else on earth, especially in certain cases.
And I myself am floating with wild caprice in the midst of this nebulous mass of fourteen hundred thousand times the volume of the earth into which it will one day be condensed, and carried forward amongst the planetary bodies.
On the other hand, man always needs a market for his products; unable to compare values of different kinds, he is satisfied to judge approximately, according to his passion and caprice; and he engages in dishonest commerce, which always results in wealth and poverty.