IPA: /ˌʌnəˈrɪdʒənl/
KK: /ʌnˈɔrɪdʒənl/
Not new or different; lacking creativity or freshness.
The movie was criticized for its unoriginal plot and predictable ending.
Unoriginal → It is formed from "un-" (meaning not) and "original" (from Latin "originem", meaning beginning or source). The word "unoriginal" means not being original or lacking uniqueness.
Think of 'not' ('un-') being added to 'beginning' or 'source' ('origin') — that's why unoriginal means lacking originality.