Under

See also:

Undecided, Undeclared, Undefiled, Undefined, Undelivered, Undeniable, Undercarriage, Underestimates, Underfoot, Underfunded, Undergirded, Undergirding, Undergo, Undergoes, Underground, Underlying, Undermine, Underneath, Underpants, Underscores, Undersea, Undersetters, Understand, Understandable, Understandest, Understandeth, Understanding, Understands, Understate, Understood, Undertake, Undertaken, Undertaking, Undertook, Underused, Underway, Underweight, Underwent, Underworld, Undesirable, Undetermined, Undeterred