serious vs sincere

serious and sincere both are adjectives.

Word	Noun	Adjective	Verb	Adverb
serious	No	Yes	No	No
sincere	No	Yes	No	No

serious (adjective)	sincere (adjective)
concerned with work or important matters rather than play or trivialities	open and genuine; not deceitful
completely lacking in playfulness	characterized by a firm and humorless belief in the validity of your opinions
causing fear or anxiety by threatening great harm
requiring effort or concentration; complex and not easy to answer or solve
of great consequence
appealing to the mind