lack

/ˈlak/

verb

  1. to be deficient or missing

  2. to be short or have need of something

  3. to stand in need of : suffer from the absence or deficiency of

time is lacking for a full explanation

noun

  1. the fact or state of being wanting or deficient

  2. something that is lacking or is needed

a lack of evidence

idiom

  1. failure to act

The protesters criticized the administration's lack of action on many issues.