Lacking in quality or durability; cheap, shoddy, or poorly made.
このおもちゃはちゃちで、すぐ壊れてしまった。
This toy was shoddy and broke quickly.
ちゃちな作りのバッグは見た目も安っぽく見える。
A cheaply made bag also looks tacky.
そんなちゃちな言い訳は通用しないよ。
That flimsy excuse won't work.