integral

basic, deep-rooted, elemental, fundamental

congenital, hereditary, inherited, inmost, inner, interior

internal

characteristic, distinctive, peculiar

habitual, inveterate

normal, regular, typical

prerequisite

compulsory, mandatory, nonelective, obligatory

consequential, crucial, important, major, material, meaningful, momentous, significant, substantial, weighty

basic, central, fundamental, key, organic

insistent, persistent, pressing, urgent

unabridged, uncut, undiminished

all-out, exhaustive, extensive, maximal

full-blooded, full-blown, full-bore, full-fledged, full-on, full-out, full-scale