An objection.
Physical danger from the environment, especially with risk of drowning
An obstacle that hinders achievement of a goal.
The state of being difficult, or hard to do.
An awkward situation or quarrel.
That which cannot be easily understood or believed.
Objection.
A difficulty that has to be resolved or dealt with.
A puzzling circumstance.
A set of moves required to complete a climb.
A question to be answered, schoolwork exercise.
Difficulty in accepting or understanding or refusal to accept or understand.
Causing a problem; problematic; troublesome.
Difficult to train or guide; unruly.