This is the 477th most frequent Finnish word.
poikkeuksellisen
Exceptionally.
The word 'poikkeuksellisen' is used as an adverb to intensify the adjective 'lämmin', meaning 'warm', indicating that the warmth is beyond usual expectations.
Sää oli poikkeuksellisen lämmin tänään.
The weather was exceptionally warm today.
Here, 'poikkeuksellisen' intensifies the adjective 'huomattava', translating to 'remarkable', showing that the remarkableness of his talent is beyond ordinary.
Hänen lahjakkuutensa on poikkeuksellisen huomattava.
His talent is exceptionally remarkable.
The usage of 'poikkeuksellisen' here emphasizes the unusual nature of the warmth during the weekend.