The word obstinacy means exhibiting or having the characteristic of obstinacy, which is stubbornness or perhaps doggedness. Example sentences might be:
The obstinacy of the pack mule slowed the...
(The words may be part of separate clauses, or the letter I could specifically refer to the letter of the alphabet. Otherwise, the proper conjugation is "am.")Examples:The one that I like the best is...
"I would like to return the gift you gave to me." "I understand you are trying to help me." "I don't get why this is always happening to me." I really hope that aunt shelly will get ME a great gift...