Answer:
Callous
(kæləs )
Explore 'callous' in the dictionary
A callous person or action is very cruel and shows no concern for other people or their feelings. [...]
callousness UNCOUNTABLE NOUN
callously ADVERB [ADVERB with verb]
Explanation:
disregard
(dɪsrɪgɑːʳd )
Explore 'disregard' in the dictionary
VERB
If you disregard something, you ignore it or do not take account of it. [...]
Disregard is also a noun. [...]
See full entry