The phrase "like a snake in the grass" typically refers to someone who is deceptive, cunning, and untrustworthy. Antonyms for this phrase would be words that describe someone who is honest, straightforward, and trustworthy. Examples of antonyms include words like sincere, open, frank, candid, forthright, and honest. These words all suggest a person who is genuine and reliable, without any hidden agenda or ulterior motives. So, unlike a snake in the grass, these individuals are seen as transparent and trustworthy, and you always know where you stand with them.