Adjective
1. lacking or indicating lack of confidence or assurance;
"uncertain of his convictions""unsure of himself and his future""moving with uncertain (or unsure) steps""an uncertain smile""touched the ornaments with uncertain fingers"2. not established beyond doubt; still undecided or unknown;
"an uncertain future""a manuscript of uncertain origin""plans are still uncertain""changes of great if uncertain consquences""without further evidence his story must remain uncertain"3. not established or confirmed;
"his doom is as yet unsealed"4. not firm or secure;
"balancing three boxes in an uncertain pile"5. not certain to occur; not inevitable;
"everything is uncertain about the army""the issue is uncertain"6. subject to change;
"a changeable climate""the weather is uncertain""unsettled weather with rain and hail and sunshine coming one right after the other"7. not safe from danger or mishap;
"faced an uncertain future""an unsure existence"8. not consistent or dependable;
"an uncertain recollection of events""a gun with a rather uncertain trigger"9. ambiguous (especially in the negative);
"she spoke in no uncertain terms"