This is the 612th most frequent Hungarian word.
meglepő
Surprising.
'Meglepő' is used as an adjective here to describe the noun 'hír' (news), attributing it with the quality of being surprising.
A meglepő hír gyorsan elterjedt a városban.
The surprising news quickly spread throughout the town.
'Meglepőnek' is the inflected form (here in the dative case) of the adjective 'meglepő', again used to attribute an unexpected quality to the noun 'döntés' (decision).
Elsőre meglepőnek tűnt a döntés, de később megértettem az okát.
At first, the decision seemed surprising, but later I understood its reason.
Here, 'meglepő' is also an adjective, characterizing the noun 'részlet' (detail) as unexpected.