For certain and Matter-of-factly

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

Matter-of-factly and for certain are semantically related. In some cases you can use "Matter-of-factly" instead an adverb phrase "For certain".

For certain and matter-of-factly are semantically related. Sometimes you can use "For certain" instead an adverb phrase "Matter-of-factly".