serious vs dangerous

serious and dangerous both are adjectives.

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

As adjectives, serious and dangerous are synonyms defined as:

serious and dangerous: causing fear or anxiety by threatening great harm

Other synonyms of serious include grave, grievous, life-threatening, severe.

serious (adjective)	dangerous (adjective)
concerned with work or important matters rather than play or trivialities	involving or causing danger or risk; liable to hurt or harm
completely lacking in playfulness	causing fear or anxiety by threatening great harm
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