uncertain adj.
1 not confident
VERBS be, feel, look, seem | become
ADV. deeply, very I feel deeply uncertain about the future. | a little, rather, slightly | strangely
PREP. about, as to He seemed strangely uncertain as to how to continue. | of We were rather uncertain of the direction it came from.
2 not known exactly
VERBS be, look | become | remain, seem
ADV. extremely, highly, very | increasingly | quite, rather, somewhat | still Whether diet is an important factor in this illness is still uncertain. | inevitably, inherently The world is inherently uncertain. | notoriously Cost estimates are notoriously uncertain in this business.
You can also check other dicts: uncertain (English, 中文解释 ), wordnet sense, Collins Definition