lack /læk/noun 2verb 5forms 6 noun2 •the state of not having enough of something, or of not having it at allIt is a question of money, or lack of same. •(no longer used) A defect or failing; moral or spiritual degeneracy. verb5 •To be without, not to have, to need, to require.My life lacks excitement. •To be short (of or for something).He'll never lack for company while he's got all that money. •To be off one's guard.His opps caught him lacking. •(no longer used) To be in want.The young lions do lack, and suffer hunger […] — 1611 •(no longer used) To see the deficiency in (someone or something); to find fault with, to malign, reproach.That is Mede þe Mayde quod she · hath noyed me ful oft / And ylakked my lemman. — 1550 formslacked · lackt · lacking · lacketh · lacks · lackest