Thanks to Ken, Ryan, and Tim for their answers, here’s my poke at the question. Of course comments are still welcome; I can’t pretend to have the final word.
The opposite of faith is idolatry
There is no opposite to faith in the sense of an total absence of it (so says Ryan), but there is an opposite in the sense that faith can be, and often is, misplaced. “Idolatry” is a word both tired out by misuse and loaded with cultic connotations, so perhaps it’s not the best one for this context. But I use it advisedly to suggest that the opposite of faith is to put foundational trust in something other than God. Most often these days (as Tim and Ken suggest in different ways) that takes the form of placing foundational trust in my knowledge and my experience, so that in our context, another opposite for faith might be pride.
The opposite of hope is resignation…
…because hope is something active, something that dies when it is not practiced. The hope of salvation then, is not the reassurance that I’ve got a cloud with my name on it, but rather reconciliation between enemies, the inclusion of the marginalized, the provision of daily bread—the embodiment of Jesus Christ in the present. Resignation is the mark of someone subject to fate. Hope is the fruit that grows in someone who prays in God’s name.
The opposite of love is fear:
I was going to say indifference, but I think that Tim’s answer gets even more radically at the source of indifference. To love means to commit oneself and one’s resources in openness to another. We are often indifferent because we fear, and perhaps rightly so, for a lack of time, a lack of resources, a lack of energy. We are indifferent because we project scarcity. The word “love” in Christian circles is often conjoined to the modifier “self-giving” which of course calls to mind the most basic definition of love that Christians can know—the cross. And, precisely there in the cross, faith, hope, and love hold together.