forbearing
1. [ adjective ] showing patient and unruffled self-control and restraint under adversity; slow to retaliate or express resentment
Synonyms: longanimous
Examples:

"seemly and forbearing...yet strong enough to resist aggression" "was longanimous in the face of suffering"

Related terms: patient
Similar spelling:   forbear
  forebear
  forbearance
  forbear_from
  four-party