informal
adj.
mid-15c., "lacking form; not in accordance with the rules of formal logic," from in-(1) "not, opposite of" + formal. Meaning "irregular, unofficial" is from c.1600. Sense of "done without ceremony" is from 1828. Related: Informally.
| 词汇 | informal |
| 词根词缀 | Online Etymology Dictionary informal adj. mid-15c., "lacking form; not in accordance with the rules of formal logic," from in-(1) "not, opposite of" + formal. Meaning "irregular, unofficial" is from c.1600. Sense of "done without ceremony" is from 1828. Related: Informally. |
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