inglorious

adjectives

(used of conduct or character) deserving or bringing disgrace or shame
"Man...has written one of his blackest records as a destroyer on the oceanic islands"- Rachel Carson; "an ignominious retreat"; "inglorious defeat"; "an opprobrious monument to human greed"; "a shameful display of cowardice"
not bringing honor and glory
"some mute inglorious Milton here may rest"
antonym
is similar to
not famous or acclaimed
"an obscure family"; "unsung heroes of the war"
see also
lacking honor or integrity; deserving dishonor
"dishonorable in thought and deed"
see also
not known
"an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"