unsure

adj.

1. Lacking confidence.
2. Uncertain of the facts.
3. Precarious; unstable; unreliable.

unsurely un·sure'ly adv.

adjective

1. Not affording certainty: ambiguous, borderline, chancy, clouded, doubtful, dubious, dubitable, equivocal, inconclusive, indecisive, indeterminate, problematic, problematical, questionable, uncertain, unclear. Informal iffy. Idioms: at issue, in doubt, in question. See certain/uncertain, clear/unclear.
2. Marked by lack of firm decision or commitment; of questionable outcome: indefinite, open, uncertain, undecided, undetermined, unresolved, unsettled, vague. Idioms: up in the air. See certain/uncertain.
3. Lacking stability: infirm, insecure, precarious, shaky, tottering, tottery, unstable, unsteady, weak, wobbly. See change/persist, strong/weak.
4. Experiencing doubt: doubtful, dubious, skeptical, uncertain, undecided. Idioms: in doubt. See certain/uncertain.

adj

Definition: doubtful, insecure
Antonyms: certain, definite, secure, sure, undoubted

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IN BRIEF: Not certain.

Those tentative about making plans are often unsure of their ability to show up. — Michael Levine.

Dansk (Danish)
adj. - usikker

Nederlands (Dutch)
onzeker, twijfelachtig

Français (French)
adj. - peu sûr, qui manque de confiance en soi

Deutsch (German)
adj. - unsicher

Ελληνική (Greek)
adj. - αβέβαιος

Italiano (Italian)
incerto

Português (Portuguese)
adj. - inseguro, incerto

Русский (Russian)
неуверенный, ненадежный, некомпетентный

Español (Spanish)
adj. - inseguro

Svenska (Swedish)
adj. - osäker, otrygg, oviss, tveksam

中文（简体）(Chinese (Simplified))
没有自信的, 不确定的, 不肯定的

中文（繁體）(Chinese (Traditional))
adj. - 沒有自信的, 不確定的, 不肯定的

한국어 (Korean)
adj. - 불확실한, 확신이 없는

日本語 (Japanese)
adj. - 確信のない, 不安定な

العربيه (Arabic)
‏(صفه) غير واثق بنفسه, غير متيقن‏

עברית (Hebrew)
adj. - ‮לא בטוח, מפוקפק‬

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