有没有L开头英文单词表示傻瓜之类的意思的

有，

lout ＝ An awkward and stupid person; an oaf， 笨拙，愚蠢，不灵活，呆子

lubber ＝ a big, awkward, or stupid person 蠢大的人

lummox ＝ A clumsy or stupid person. 笨拙或愚蠢的人

lumpish ＝ （非正式）Stupid or dull. 蠢或迟钝

lamebrain ＝ a stupid person， a dolt 苯人

lurdan ＝ （非正式）a stupid or dull person；dull or stupid

loon ＝ （非正式）a simple-minded or stupid person

lout ＝ An awkward and stupid person; an oaf.

lumpen ＝ （非正式）stupid or unthinking，愚蠢，或不动脑子

lobcock ＝A dull, sluggish person; a lubber; a lob. 迟钝，懒散的人

loggerhead ＝ （非正式）A blockhead; a dolt.傻瓜，笨蛋

looby ＝ a foolish or stupid person

loord ＝ A dull, stupid fellow; a drone. 迟钝，蠢货，不务正业的人

lug ＝ （俚语）A clumsy fool; a blockhead.

lunkhead ＝ （俚语）A stupid person; a dolt.

loopy ＝ （非正式）slightly mad, crazy, or stupid 稍微愤怒或疯狂，或苯

lubberly ＝ A clumsy person.（不灵活，笨拙的人）

luser ＝ loser+user，这个源自MIT的IT用语，表示person who doesn't have the faintest idea what they're doing and who, more importantly, refuses to do anything about it. 有蠢，不灵活，死脑筋的意思。