No, those words are rarely heard. The dictionary lists words such as soft, sensitive and sympathetic as synonyms which are heard in everyday speech.
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Shawn79those words are rarely heardCan I still use them for literary purpose?
avid learnerI wonder, are "uncallous" and its derivatives (uncallousness, uncallously) words in standard English?Uncallous/uncallousness/uncallously aren't words in English.
avid learnerCan I still use them for literary purpose?I would say no. I did find the three forms you cited in one dictionary, but most would not consider them real words. And those three forms failed my spellchecker too.
Shawn79I did find the three forms you cited in one dictionaryPlease give me the link or its name..
prajwalkrThe opposite of callous , though very rarely used, would be uncalloused.I think uncalloused is the opposite of calloused whose meaning is more specific then callous.