This is an exaggeration to say that Solomon will keep Adonijah safe. Alternate translation: "not a hair of his head will fall" or "I will keep him safe" (See: [[rc://en/ta/man/translate/figs-explicit]] and [[rc://en/ta/man/translate/figs-hyperbole]])
The abstract noun "wickedness" can be translated as a verb. It is spoken of as if it were an object that could be found in a container. This can be translated in active form. Alternate translation: "he does what is evil" (See: [[rc://en/ta/man/translate/figs-abstractnouns]] and [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-activepassive]])