出典:Wiktionary
From Middle English lustsum, from 古期英語 *lustsum (attested only in 古期英語 lustsumlīċ (“pleasant, delectable”)), from Proto-Germanic *lustusamaz (“delightful, desirous”), equivalent to lust + -some. Cognate with Middle Low German lustsām (“friendly, lovely”), obsolete Dutch lustzaam (“pleasant, beautiful, charming”), obsolete German lustsam (“pleasing, graceful”).