uncertainty

The state of being unsure about something; a situation or outcome that is not known or fixed.

• uncertain/ʌnˈsɜːtən/(adj)不确定的
• certainly/ˈsɜːtənlɪ/(adv)肯定地
• certainty/ˈsɜːtəntɪ/(n)确定性

• economic uncertainty
• period of uncertainty
• deal with uncertainty
• create uncertainty
• reduce uncertainty
• live with uncertainty

1. 1.Prolonged uncertainty about the organisation's future made it difficult to recruit and retain talented staff.
2. 2.Leaders who can communicate clearly and calmly during periods of uncertainty are particularly valued.

• doubt/daʊt/— unsureness about something
• ambiguity/ˌæmbɪˈɡjuːɪtɪ/— openness to multiple interpretations
• unpredictability/ˌʌnprɪˌdɪktəˈbɪlɪtɪ/— inability to know in advance

from "un-" (not) + "certainty" — from Latin "certus" (settled, sure)