Related Clues:

• Innocent
• Inoffensive
• Like a sure bet
• Innocuous
• Safe
• Fail-safe
• Without a downside
• Can't-miss
• Perfectly safe, as an investment
• Like some investments
• Surefire, as an investment
• Safe, as an investment
• Not producing any toxic effects
• Innocuous, benign
• Innocuous, innocent