... ときく => I heard N2
Speculation
昼となく夜となく => day and night N1
Continuous
ないと/なくちゃ/なきゃ => must do; need to; gotta do ~ N3
~ごとき/ごとく      => like; as if; the same as ~ N1
て/なくて => Because/Because not N4
ごとく,ごとき => Like A, as if A N1
Adjectival, Descriptions
どことなく => Somewhere N2
Vague
少なくとも => at least ~ N2
なんとなく => for some reason, somehow N3
Vague
なくては => If not... then no... N3
Conditions (necessary conditions)
なくして(は)~ない => cannot do without ~ N1
ときとして…ない => At no time N2
Emphasize the negative meaning