IPA: //ʌnˈstɛdiɪst//
KK: /ʌnˈstɛdiɪst/
This word describes something that is not stable or balanced, and it is the highest degree of that quality.
The unsteadiest part of the bridge swayed dangerously in the wind.
Comparative: less unsteady
Superlative: most unsteady
Unsteadiest → It is formed from "un-" (meaning not) and "steady" (from Old English "stēadig", meaning firm or stable) and the superlative suffix "-est" (meaning most). The word "unsteadiest" means the most not firm or stable, describing something that is the least steady.
Think of 'not' ('un-') being added to 'firm' ('steady') to remember that 'unsteadiest' means the most unstable or least firm.
No commonly confused words.