on the house (adjective) on the house: for free
Sinonime: disregarded, glossed over,
hidden,
inconspicuous, neglected, overlooked, passed by, pushed aside,
secret, unconsidered, undiscovered, unheeded, unobserved,
unobtrusive, unperceived, unrecognized, unremarked, unremembered, unrespected,
unseen, winked at
Antonime: noted, noticed, seen