Word family noun formality ≠ informality formalization adjective formal ≠ informal verb formalize adverb formally ≠ informally
From Longman Dictionary of Contemporary Englishinformalin‧for‧mal /ɪnˈfɔːməl $ -ɔːr-/ ●●● W3 adjective 1 RELAXEDFRIENDLYrelaxed and friendly without being restricted by rules of correct behaviour OPP formal The atmosphere at work is fairly informal. The two groups met for informal talks.2 ALan informal style of writing or speaking is suitable for ordinary conversations or letters to friends OPP formal3 DCCinformal clothes are suitable for wearing at home or in ordinary situations SYN casual OPP formal —informally adverb —informality /ˌɪnfɔːˈmæləti $ -fɔːr-/ noun [uncountable]Examples from the Corpus
informal• The two companies have an informal arrangement to share each other's sports and leisure facilities.• The report was based on informal discussions with women MPs and their families.• I was offered the job after an informal interview in the staff canteen. 