Synonyms for Is necessary:

• v.

  •ought to (verb)
  • requires,
  • behooves,
  • must.

• Other synonyms:

  •Other relevant words:
  • have to,
  • ought to,
  • is fitting,
  • is reasonable,
  • is responsible for,
  • is becoming,
  • is logical,
  • is natural,
  • had to,
  • has to,
  • having to.