Uncertain a. : Not certain; not having certain knowledge; not assured in mind; distrustful.

Uncertain a. : Irresolute; inconsonant; variable; untrustworthy; as, an uncertain person; an uncertain breeze.

Uncertain a. : Questionable; equivocal; indefinite; problematical.

Uncertain a. : Not sure; liable to fall or err; fallible.

Uncertain a. : To make uncertain.

Example:
I'm feeling a little Uncertain with one of my friends wants a place to stay for about a month?

Taxonomy
Merriam-Webster Online Dictionary, tain, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, glossary, english, language, ESL, Search, r-t, adjective, 14th century, time of departure, ally, doubt.

Defination from the web:
uncertain from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... is uncertain> 2 : not certain to occur : problematical <his success was uncertain> 3 : not reliable : untrustworthy <an uncertain ally> ...