Precarious
Part of speech: adjective
Definition: dangerously insecure or unstable; perilous depending on the intention of another
Example sentence: All progress is precarious, and the solution of one problem brings us face to face with another problem.
Uneasy
Part of speech: adjective
Definition: Not easy; difficult.Restless; disturbed by pain, anxiety, or the like; disquieted; perturbed.Not easy in manner; constrained; stiff; awkward; not graceful; as, an uneasy deportment.Occasioning want of ease; constraining; cramping; disagreeable; unpleasing.
Example sentence: I think human self-hatred may be the great untold story of the millennium. It's the common thread linking deep ecology and animal rights, the love and money we lavish on pets, the uneasy longing for extraterrestrials to be meddling with us.