main, principal, important

a division / something that divides two objects

heavy, weighty / involving large-scale manufacture, heavy / great in degree, heavy, serious, severe, hard, difficult

the number of overlaps; fold, layer

weight

(colloquial) current boyfriend

everything

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all

not in the mood to do things; having a heavy mood