From The Collaborative International Dictionary of English v.0.48 [gcide]:
Unkept \Unkept\
See kept.
From WordNet (r) 3.0 (2006) [wn]:
unkept
adj 1: (especially of promises or contracts) having been
violated or disregarded; "broken (or unkept) promises";
"broken contracts" [syn: broken, unkept] [ant:
kept, unbroken]