Uncertain
Part of speech: adjective
Definition: not known for certain; questionable not yet determined; undecided variable and subject to change fitful or unsteady unpredictable or capricious
Example sentence: Live life for the moment because everything else is uncertain!
Ambiguous
Part of speech: adjective
Definition: Open to multiple interpretations.Vague and unclear.Of persons: hesitant; uncertain; not taking sides.
Example sentence: The performances I enjoy are the ones that are hard to read or ambiguous or left-of-centre because it makes you look closer and that's what humans are like - quite mysterious creatures, hard to pinpoint.