the capacity to accept or tolerate delay, problems, or suffering without becoming annoyed or anxious.
simliar:
forbearance
tolerance
restraint
self-restraint
resignation
stoicism
fortitude
sufferance
endurance
calmness
composure
even temper
even-temperedness
equanimity
equilibrium
serenity
tranquillity
imperturbability
unexcitability
understanding
indulgence
lenience
kindness
consideration
longanimity
inexcitability
perseverance
persistence
tenacity
diligence
assiduity
application
staying power
indefatigability
doggedness
determination
resolve
resolution
resoluteness
obstinacy
insistence
singleness of purpose
purposefulness
pertinacity