IPA: /ˌʌnəˈkɒmədeɪtɪŋ/
KK: /ʌnəˈkɑːmədeɪtɪŋ/
Not willing to help or make things easier for others; inflexible or unyielding.
The hotel staff was unaccommodating when we requested a late check-out.
Unaccommodating → It is formed from "un-" (meaning not) and "accommodating" (from Latin "accommodare", meaning to make fit or adapt). The word describes a state of not being willing to adapt or make fit for others' needs.
Think of 'not' ('un-') being willing to 'adapt' ('accommodate') to others — that's why unaccommodating means not willing to adapt.