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Oxford Dictionary 
superlative adjective: intensest
superlative form of intense: most intense

Urban Dictionary
intensest
Vested interest in the internet.


SENTENCE EXAMPLES

The results of his intensest meditations on the psychology and the human and divine significance of the event (on which he has left some pregnant hints in written words of his own) are perfectly fused with those of his subtlest technical calculations on the rhythmical balancing of groups and arrangement of figures in space.