IPA: /ʌnˈstɛdiər/
KK: /ʌnˈstɛdier/
Not stable or firm; likely to wobble or change position easily.
The unsteadier the boat became, the more anxious the passengers felt.
Comparative: unsteadier
Superlative: unsteadiest
Unsteadier → It is formed from "un-" (meaning not) and "steady" (from Old English *stædige*, meaning firm or stable) and the comparative suffix "-er" (indicating more). The word "unsteadier" means more not firm or less stable than something else.
Think of 'not firm' ('un-') and 'steady' to remember that 'unsteadier' means more unstable or less steady.