underlying
US /ˌʌn.dɚˈlaɪ.ɪŋ/
UK /ˌʌn.dɚˈlaɪ.ɪŋ/

1.
subjacente, fundamental
forming a foundation or basis; fundamental
:
•
The underlying cause of the problem was a lack of communication.
A causa subjacente do problema era a falta de comunicação.
•
There is an underlying tension in their relationship.
Há uma tensão subjacente no relacionamento deles.