Unpositive

[…] no nation is going to dare provoke an atomic war with us unless it is convinced that the first shock will do away with our power, to use a rather unpositive word, to retaliate.

The following three statements will provide an elementary example of what is meant by range: He's 24 years old (positive). He may be about 24 years old (tentative). I'm not sure how old he is (unpositive/uncertain) […]