1. delicate, fragile, frail, breakable (vs. unbreakable)

usage: easily broken or damaged or destroyed; "a kite too delicate to fly safely"; "fragile porcelain plates"; "fragile old bones"; "a frail craft"

2. fragile, delicate (vs. rugged)

usage: vulnerably delicate; "she has the fragile beauty of youth"

3. flimsy, fragile, slight, tenuous, thin, insignificant (vs. significant), unimportant

usage: lacking substance or significance; "slight evidence"; "a tenuous argument"; "a thin plot"; a fragile claim to fame"

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See also: fragile (Dictionary)