défaut [m] (le ~), insuffisance [v] (l' ~), manque [m] (le ~), privation [v] (la ~), vice [m] (le ~) {zn.} lack
want
defect
absence
gap
flaw
deficiency
shortcoming
shortage
Je manque de confiance.
I lack confidence.
Elle mourut par manque d'air.
She died for lack of air.