IPA: /nɒnˈdaɪvərsaɪvd/
KK: /nɑnˈdaɪvərˌsaɪvd/
Not varied or mixed; lacking in diversity or variety.
The company's investments are nondiversified, focusing only on one industry.
Nondiversified → It is formed from "non-" (meaning not) and "diversified" (from Latin "diversificare", meaning to make diverse or varied). The word "nondiversified" means not made diverse or varied, indicating a lack of variety or difference.
Think of 'not' ('non-') and 'made diverse' ('diversified') to remember that 'nondiversified' means lacking variety.