IPA: //ʌnˈaɪdəl//
KK: /ʌnˈaɪdəl/
Not the best or most suitable; less than perfect.
The weather conditions for the picnic were unideal, with rain and strong winds.
Comparative: more unideal
Superlative: most unideal
Unideal → It is formed from "un-" (meaning not) and "ideal" (from Greek "idealis", meaning pertaining to an idea or standard of perfection). The word "unideal" means not conforming to an ideal or standard of perfection.
Think of 'not' ('un-') being added to 'ideal', which helps you remember that 'unideal' refers to something that does not meet the standard of perfection.