べつだん…ない => not really, not particularly ... N2
Description
べつだんの => particular; special N2
Description
いつかの ... => Previously N4
Time
~且つ(かつ) => and N1
Line up, list
いつも => always; usually; habitually N5
~つい      => accidentally; unintentionally; by mistake N3
Regret
つつ => while; even though; despite ~ N2
いつしか => before one knows N2
Accept, agree
いつか => Since when (Don't know) N4
Time
~いかんだ / いかんで、~ /  ~いかんによって、~ => It depends ... N1
Related, corresponding
いつか ... た => Formerly (At some point) N4
Time
いつ => when; at what time; how soon N5