The phrase "by hook" is often used to mean accomplished through any means necessary, particularly those that may be unconventional or even questionable. There are a number of synonyms that can be used for this phrase, depending on the context and tone of the sentence. These might include "through cunning," "by trickery," "by any means," "using subterfuge," or "by fair means or foul." Each of these phrases carries slightly different connotations, and choosing the right one can help to convey a specific message or attitude. Ultimately, the best choice of synonym will depend on the context and the speaker's intent.