Adjective

(en adjective)

Not certain; unsure.

*(John Tillotson) (1630-1694)

*:Man, without the protection of a superior Being,is uncertain of everything that he hopes for.

Not known for certain; questionable.

:

Not yet determined; undecided.

Variable and subject to change.

Fitful or unsteady.

*

*:Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when, of a sudden, she stopped short and for a little stood like a stricken thing, quite motionless save that she quaked to her very marrow in the grasp of a great and enervating fear.

Unpredictable or capricious.

*Sir (Walter Scott) (1771-1832)

*:O woman! in our hours of ease, / Uncertain , coy, and hard to please!

Adjective

(en adjective)

Having, or expressing doubt; questioning.

* {{quote-magazine, year=2012, month=March-April

, author=Colin Allen , title=Do I See What You See? , volume=100, issue=2, page=168 , magazine=(American Scientist) citation , passage=Numerous experimental tests and other observations have been offered in favor of animal mind reading, and although many scientists are skeptical , others assert that humans are not the only species capable of representing what others do and don’t perceive and know.}}

My teacher was skeptical when I told her my dog ate my homework.

I can see why people are so skeptical [sic] about him, but I think he's on to something here. (regarded by organizations such as the BBC as an error)

Of or relating to skepticism or the skeptics.