cornerstone (noun) cornerstone: vital element
Sinonime: bashful, buttoned up, checked, clammed up, close, closed up, closemouthed, curbed,
dumb, dummied up,
faint, hush, hushed, iced, inarticulate,
incoherent, inconversable,
indistinct, inhibited,
laconic, mousy, mum,
mute, muted, noiseless, nonvocal, not talkative, reserved, restrained, reticent, shy, silentious, soundless,
still, struck dumb, taciturn, tongue-tied,
unclear, uncommunicative, unheard, unsociable, unspeaking, voiceless, wordless, zipped
Antonime: clamorous, communicative,
noisy, talkative