For certain and In all likelihood

For certain adverb - Definitely or positively (`sure' is sometimes used informally for `surely').

In all likelihood and for certain are semantically related. In some cases you can use "In all likelihood" instead an adverb phrase "For certain".

In all likelihood adverb - With considerable certainty; without much doubt.

For certain and in all likelihood are semantically related. Sometimes you can use "For certain" instead an adverb phrase "In all likelihood".