underinsurance

noun

un·​der·​in·​sur·​ance

ˌən-dər-in-ˈshu̇r-əns

1

: insufficient insurance

2

: insurance coverage protecting usually against uninsured or underinsured motorists by compensating the insured if the tortfeasor's liability policy limits fall short of the insured's losses : insurance providing uninsured motorist coverage