What is an acronym for timid?

There isn't a commonly used acronym for "timid". Acronyms are typically formed from the first letters of words in a phrase, and "timid" is a single word.

If you're looking for a way to abbreviate "timid," you could use "tm" or "tmd," though these are not official abbreviations.

It's important to remember that using informal abbreviations can be confusing in formal settings.