un·der·re·act 
(ŭn′dər-rē-ăkt)
(ŭn′dər-rē-ăkt)intr.v. un·der·re·act·ed, un·der·re·act·ing, un·der·re·acts
To react with insufficient enthusiasm, force, or emphasis.
un′der·re·action n.
- underpaid
- under pain of
- underpants
- underpart
- underpass
- underpay
- underpayment
- underperform
- underperformance
- underperformer
- underpin
- underpinning
- underplay
- underplot
- underpopulated
- underpopulation
- underprice
- underprivileged
- underproduce
- underproduction
- underproof
- underprop
- underran
- underrate
- underreact