1) Adamancy 2) Bullheadedness 3) Firmness 4) Impenitence 5) Impenitency 6) Inflexibility 7) Intransigence 8) Intransigency 9) Mulishness 10) Obstinacy 11) Obstinance 12) Pigheadedness 13) Tenacity 1) Defiance 2) Determination 3) Doggedness 4) Dogmatism 5) Drive 6) Firmness 7) Inflexibility 8) Insistence 9) Intractability 10) Intractableness 11) Intransigence 12) Mulishness 13) Obduracy 14) Obstinacy 15) Obstinance 16) Persistence 17) Pig-headedness 18) Resolve 19) Rigidity 20) Rigor 21) Steadfastness 
[n] - the trait of being difficult to handle or overcome 2. [n] - resolute adherence to your own ideas or desires
[Othello] (20) roughness.
obstinacy 1 obstinance 1 pigheadedness noun resolute adherence to your own ideas or desiresobstinacy noun the trait of being difficult to handle or overcome