in-grain (verb) ingrain: imbue
Sinonime: camouflaged, concealed, dim, faint, having, hidden, indistinct, insignificant, low-key, low-profile, modest, muted, obscure, ordinary, plain, quiet, retiring, secretive, shy*, soft-pedalled, subtle, tenuous, unassuming, unconspicuous, unemphatic, unobtrusive, unostentatious