Does an widowed woman sin by not removing hair from her hands and legs, claiming it is adornment for her husband who has passed away, and is this considered imitation of men?

There is no harm in a widow, or any other woman, leaving the hair on her arms and legs, as removing it is permissible and not obligatory. However, it is forbidden for a woman observing the 'iddah (waiting period) after her husband's death to remove the hair from her arms and legs, as this constitutes adornment.