The phrase "most snowy haired" can be described using a range of synonyms. Some alternatives include "frosty-haired" or "hoary-haired," both of which evoke a sense of age and wisdom. Other descriptive phrases might include "wispy-haired," "cottony-haired," or "silver-haired," all of which suggest a certain ethereal quality to the hair. For a more descriptive term, one might consider using "snowflake-haired" or "blizzard-haired," both of which carry strong wintery connotations. Ultimately, the specific choice of words will depend on the desired effect, whether the writer is aiming to convey a sense of mystery, wisdom, or coldness.