[{"Bold_text": "adjective", "List Items": ["not sharp; blunt:a dull knife.Antonyms: keen , sharp", "causing boredom; tedious; uninteresting:a dull sermon.Synonyms: vapid , dreary , tiresome , boring Antonyms: interesting", "not lively or spirited; listless.Synonyms: inert , inactive , torpid , apathetic", "not bright, intense, or clear; dim:a dull day; a dull sound.", "having very little depth of color; lacking in richness or intensity of color.", "slow in motion or action; not brisk; sluggish:a dull day in the stock market.", "mentally slow; lacking brightness of mind; somewhat stupid; obtuse.Synonyms: unimaginative , stolid , unintelligent Antonyms: bright", "lacking keenness of perception in the senses or feelings; insensible; unfeeling.", "not intense or acute:a dull pain."]}, {"Bold_text": "verb (used with or without object)", "List Items": ["to make or become dull.Synonyms: benumb , deaden , blunt , discourage , dishearten , depress"]}]