lacking

inadequate

Not sufficient for purpose

• insufficientBelow required quantity
• defectiveHaving inherent faults
• faultyHaving defects or errors

flawed · impaired · substandard · inferior · poor · weak · limited · meager · sparse · scant

missing

Not present, whereabouts unknown

• goneNo longer present
• unavailableCannot be accessed
• vanishedDisappeared from sight

disappeared · lost · nonexistent · empty · vacant · devoid · without · bereft · deprived · stripped

needy

Wanting in essentials

• impoverishedExtremely lacking in money
• destituteUtterly without means
• underprivilegedLacking usual social advantages

disadvantaged · malnourished · underfed · starved · hungry · poor · wanting · bereft · stripped · robbed

immature

Not fully developed

• unfinishedNot yet complete
• incompleteLacking necessary parts
• rudimentaryIn simplest possible form

embryonic · inchoate · nascent · primitive · underdeveloped · stunted · unformed · half-baked · sketchy · rough

• unreadyunprepared, ill-prepared, ill-equipped, unready, not ready
• incompleteincomplete, unfinished, partial, fragmentary, half-done
• quantitiessome, many, few, amount, several
• scarcityscarcity, scarce, shortage, scant, scanty
• falling shortdeficient, shortfall, failure, gap, inferior
• inferiorinferior, substandard, second-rate, second-class, subpar