What Does Obstinate Condolement Mean?

In obstinate condolement is a course. Of impious stubbornness; 'tis unmanly grief; It shows a will most incorrect to heaven, A heart unfortified, a mind impatient, An understanding simple and unschool'd"

What does Claudius mean by Tis unmanly grief?

87-89) But he insults Hamlet, adding “'Tis unmanly grief.”(1.2. ... He then convinces Hamlet that his grief “shows a will most incorrect to heaven.”(1.2. 95), meaning that he should instead be happy for his father, for he is now in heaven.

What does he mean by fruitful river in the eye?

A fruitful river suggests that there are a lot of tears in a steady, unending flow. There is a river, not just a stream of tears to be cried. "The windy suspiration of forced breath" is a metaphorical description of the deep and loud sighes that come from being overwhelmed with sadness and despair.