Tenacity

Fits when informal praise for effort under pressure is appropriate

Careful Grit can glorify needless hardship and sounds too casual in a formal tribute.

Fits when continued effort is the neutral central fact

Careful Persistence can be unwanted or repetitive, while tenacity usually praises purposeful endurance.

Fits when firmness of intention deserves emphasis

Careful Determination may be present before any obstacle has tested it.

Fits when loyal constancy is as important as exertion

Careful Steadfastness can be passive, unlike tenacity in active pursuit.

Fits when physical or mental endurance over time matters

Careful Stamina supplies energy but not commitment to a particular aim.

Fits when patient continuation through a long difficulty is central

Careful Perseverance sounds more dutiful and less forceful than tenacity.

Fits when a firm decision or moral commitment is the source of strength

Careful Resolve can exist without sustained action.

Fits when stubborn-looking continuation is the defining feature

Careful Doggedness can imply inflexibility and misses inventive adaptation.

Fits when a spirit seems impossible to subdue

Careful Indomitability is grander than most ordinary achievements can support.