Fixed expression: complete the idiom meaning "not to be treated lightly" Fill the blank to complete the well-known caution: "Health is too important to be ______." Choose the option that best completes the idiomatic warning.

Given data

• A cautionary sentence: "Health is too important to be ______."
• We need the fixed phrase that expresses "must not be treated lightly".

Concept/Approach
The idiom is not to be trifled with (i.e., not to be treated lightly or carelessly). Hence, "Health is too important to be trifled with."

Option analysis
trifled with — correct idiomatic collocation. ✅neglected / ignored — grammatically possible but do not capture the set idiom.played with — informal and unidiomatic in this caution.

Usage note
The negative version is common: "X is not something to be trifled with."

Final Answer
trifled with