Lewis Short
(adjective) : illaetābĭlis (inl-), e, in-laetabilis
* Cheerless, joyless, gloomy, sad (poet.): ora,Verg. A. 3, 707: murmur,id. ib. 12, 619: hymen (with funestus),Sen. Troad. 861: onus,i. e. a dead child,Stat. Th. 5, 633: munus (with grave),id. ib. 3, 706.
Charlton T. Lewis, Charles Short, A Latin Dictionary