verb
1.
to put on a dark or malignant countenance or aspect
he frowned at the naughty child
Synonyms: gloom, glower, lower, scowl
Related Word: glare; grimace; pout, sulk
Idioms: look black, look daggers
Contrasted words: grin, laugh
Antonyms: smile
2.
Synonyms: disapprove 1, deprecate, discommend, discountenance, disesteem, disfavor, object