Depending on the will or pleasure of another; held by courtesy; liable to be changed or lost at the pleasure of another; as, precarious privileges.
Held by a doubtful tenure; depending on unknown causes or events; exposed to constant risk; not to be depended on for certainty or stability; uncertain; as, a precarious state of health; precarious fortunes.
Do I wear a helmet? Ugh. I do when I'm riding through a precarious part of town, meaning Midtown traffic. But when I'm riding on secure protected lanes or on the paths that run along the Hudson or through Central Park - no, I don't wear the dreaded helmet then. David Byrne
Liberalism, on the other hand, regards life as an adventure in which we must take risks in new situations, in which there is no guarantee that the new will always be the good or the true, in which progress is a precarious achievement rather than inevitability. Morris Raphael Cohen
The good we secure for ourselves is precarious and uncertain until it is secured for all of us and incorporated into our common life. Jane Addams
The situation in Iraq is dangerous but the regional situation is also very complicated and precarious. Joschka Fischer
All progress is precarious, and the solution of one problem brings us face to face with another problem. Martin Luther King, Jr.