недоста́ток

A deficiency or need (of something desirable or necessary); an absence, want, dearth

• This lack of responsibility is driving me crazy.

  Меня сводит с ума эта безответственность.

  Tatoeba · FeuDRenais2 · CC BY 2.0 FR

• For the lack of something better to do, Tom started cleaning his room.

  Так как заняться больше было нечем, Том начал убираться у себя в комнате.

  Tatoeba · CK · CC BY 2.0 FR

недоста́ток

A defect or failing; moral or spiritual degeneracy

To be without, not to have, to need, to require

• He is lacking in experience.

  Ему не хватает опыта.

  Tatoeba · CM · CC BY 2.0 FR

• Tom lacks experience, doesn't he?

  Тому не хватает опыта, не так ли?

  Tatoeba · CK · CC BY 2.0 FR

To be short (of or for something)

To be in want

To see the deficiency in (someone or something); to find fault with, to malign, reproachредкое