IPA: /nɒnˈstɛdi/
KK: /nɑnˈstɛdi/
Not stable or constant; changing or fluctuating over time.
The nonsteady flow of the river made it difficult for the boats to navigate.
Nonsteady → It is formed from "non-" (meaning not) and "steady" (from Old English "stede", meaning firm or stable). The word "nonsteady" means not firm or stable, indicating a lack of steadiness.
Think of 'not' ('non-') being combined with 'firm' or 'stable' ('steady') — that's why nonsteady means something that is not stable.