体重がずいぶん減ったのでズボンがとても緩い。

体重がずいぶん減ったのでずぼんがとても緩い。

My pants are very loose because I've lost much weight.

体重(たいじゅう)がずいぶん減(へ)ったのでズボンがとても緩(ゆる)い。

Taijū ga zuibun hetta node zubon ga totemo yurui.

体重 (たいじゅう)

body weight; one's weight

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

随分 (ずいぶん)

very; extremely; surprisingly; considerably; contemptible; reprehensible

減る (へる)

to decrease (in size or number); to diminish; to abate

ので (ので、んで)

that being the case; because of ...; the reason is ....; given that...

ズボン (ズボン)

trousers; pants

迚も (とても、とっても)

very; awfully; exceedingly; (not) at all; by no means; simply (cannot)

緩い (ゆるい)

loose; lenient; lax; gentle (curve, slope, etc.); slow; weak; soft; not firm

Readings: タイ、テイ、からだ、かたち

Meanings: body, substance, object, reality, counter for images

Readings: ジュウ、チョウ、え、おも.い、おも.り、おも.なう、かさ.ねる、かさ.なる、おも

Meanings: heavy, heap up, pile up, nest of boxes, -fold

Readings: ゲン、へ.る、へ.らす

Meanings: dwindle, decrease, reduce, decline, curtail, get hungry

Readings: カン、ゆる.い、ゆる.やか、ゆる.む、ゆる.める

Meanings: slacken, loosen, relax, lessen, be moderate, ease