Difference between 很 and 挺
極 = extremely 

很 = very /quite

挻 = quite/ very (colloquial)

甚 = quite/ very

頗 = quite/ considerably 

挻 is mostly a colloquial term


  We can place all these adverb directly before an adjective


Examples:

極強 (extremely strong); 很強 (very strong) ; 挻強 (quite strong); 甚強 (quite strong) 


  we need to add the adjective marker '的' to all these [adverb + adjective] structures before a noun


Examples:

極強的對手 (extremely strong opponent); 很強的對手 (very strong opponent) ; 挻強的對手 (very strong opponent); 甚強的對手 (very strong opponent)


  If the noun is placed before these [adverb + adjective] structures, we don't need the adjective marker '的' (except for 挻)


Examples:

對手極強 (opponent is extremely strong ); 對手很強 (opponent is very strong ) ; 對手甚強 (opponent is quite strong)


  Even the noun is placed before 挻強, we still need to use the adjective marker '的' after it


Example: 對手挻強的 (opponent is quite strong)

We don't usually say 對手挻強


  compound words: 極為; 很是; 甚為; 頗為, (挻 doesn't have one)