IPA: /ʌnˈstɛdɪnəs/
KK: /ʌnˈstɛdɪnəs/
The quality of not being stable or balanced, often causing wobbling or difficulty in maintaining a position.
The unsteadiness of the boat made it hard for the passengers to walk around.
Unsteadiness → It is formed from "un-" (meaning not) and "steady" (from Old English *stædige*, meaning firm or stable) and "-ness" (meaning the state of being). The word "unsteadiness" refers to the state of not being firm or stable.
Think of 'not' ('un-') being combined with 'firm' ('steady') to remember that 'unsteadiness' means the state of being not firm or stable.