The phrase "whiny little scaredy-cat" is commonly used to describe someone who is perceived as weak, timid, or overly sensitive. It can be considered inappropriate or offensive in certain contexts. If you are looking for alternative words to use in lieu of this phrase, you might consider terms like timid, anxious, hesitant, or apprehensive. Other synonyms for "whiny" might include complaining, grumbling, or moaning. However, it's important to choose your words carefully and consider how they might be received by others. Ultimately, the best way to describe someone is to focus on their specific behaviors and traits, rather than relying on broad stereotypes or cliched phrases.