Uncertain

/ʌnˈsɜːr.tən/

Meaning & Definition

adjective

Not able to be relied on; not known or definite.

The outcomes of the experiment remain uncertain due to various uncontrollable factors.

Feeling doubtful or unsure.

She felt uncertain about her decision to move to a new city.

Subject to change; not fixed.

The weather forecast is uncertain this week, with rain possible on any day.

Not clearly known or determined.

The details of the agreement are still uncertain and need to be clarified.

Late Middle English: from un- 'not' + certain.

on uncertain ground

in a precarious or insecure situation

uncertain times

periods of anxiety or instability

in uncertain terms

not clearly or definitively stated

certainty

the quality of being reliably true.

uncertainty

the state of being uncertain.

certain

known for sure; established beyond doubt.

iffy

The plan is a bit iffy right now.

up in the air

Our vacation plans are still up in the air.