Don’t eat just anyinnocuouslooking mushroom you see around.
The antonym word of the underlined word is -

Innocuous (adj):
Meaning: Not harmful or offensive.
Bengali meaning: অনপকারী; নির্বিষ
Synonym: anodyne, benign, harmless, hurtless, innocent, inoffensive, safe
Antonym: poisonous, venomous, menacing, ominous, sinister, threatening
hazardous, imperiling.
Source: Oxford Dictionary & Bangla Academy Dictionary.