Denshi Jisho — Online Japanese dictionary

結構 けっこう 1:
2: (Usually written using kana alone) splendid; nice; wonderful; delicious; sweet; (Na-adjective) sufficient; fine (in the sense of "I'm fine"); (by implication) no thank you;
3: well enough; OK; tolerable;
4: (Adverb) reasonably; fairly; tolerably;
5: (Noun) (Archaism) construction; architecture
Common word, Na-adjective, Adverbial noun, Noun 
結構者 けっこうしゃ nice person; good-natured person
Noun, Archaism 
結構人 けっこうじん nice person; good-natured person
Noun 
結構者 けっこうもの nice person; good-natured person
Noun, Archaism 
結構大変 けっこうたいへん quite a chore; not that easy; fairly difficult
Expression 

You can also

Look up kanji details for 結構.

Try a Yahoo Jisho search for 結構 .
Try a Goo Jisho search for 結構 .
Try a Google search for 結構 .