speculative — pertaining to, of the nature of, or characterized by speculation, contemplation, conjecture, or abstract reasoning: a speculative approach.
theoretical — given to, forming, or dealing with theories; speculative.
unobserved — to see, watch, perceive, or notice: He observed the passersby in the street.
conjectural — A statement that is conjectural is based on information that is not certain or complete.
theoretic — of, relating to, or consisting in theory; not practical (distinguished from applied).
unproved — to establish the truth or genuineness of, as by evidence or argument: to prove one's claim.
