結構, けっこう
NA-adjective
1. splendid, nice, wonderful, delightful, lovely, excellent, fine
2. sufficient, satisfactory, enough, all right, OK
3. not needing (any more of something), (already) having enough, fine (as in "I'm fine"), no, thank you
Adverb
4. rather, quite, fairly, pretty, surprisingly, quite a bit, fairly well
5. structure, construction, framework, architecture
どちらの日でも結構です。
悩む, なやむ
Conjugated: 悩んでいた
Godan verb, Intransitive
to be worried, to be troubled
悩んでも何の利益にもならない。
が
Particle
1. indicates the subject of a sentence
literary in modern Japanese; usu. written as ヶ in place names
2. indicates possession
Conjunction
3. but, however, (and) yet, though, although, while
4. and
5. used after an introductory remark or explanation