not ... at all

even if ...,...cannot

very, exceedingly, awfully / (before a negative form) not at all, at all, by no means

Solid, hard, firm.

Keeping a material's shape that does not crack or break apart; hard / Keeping one's appearance or facial expression; serious

a hard palate

anhydrite

硬い: keeping its physical shape or appearance under a force: stiff / 固い: keeping its shape or behaviour even under other influences: hard, firm

(phonetics) palatal