deficient vs fuckup

deficient

• A person who is deficient. 

• Insufficient or inadequate in amount. 

• Lacking something essential; often construed with in. 

• Of a number n, Having the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n). 

fuckup

• An ineffective person; a person who fucks up a lot 

• A serious mistake. 

• One who continually makes mistakes.