Strong hands is used as praise and often confuses two different things. Holding through a drawdown because the thesis is intact and the position is small enough to carry is discipline. Holding because you cannot bear to realise the loss is bag-holding-psychology wearing the same description.
The distinguishing question is whether you can state what would make you sell. A holder with a written invalidation who has not reached it is strong-handed. A holder with no exit condition is not holding, they are stuck. See diamond-hands.
Related: diamond-hands, weak-hands, bag-holding-psychology, hodl