IPA: /luːdər/
KK: /ludɚ/
More indecent or obscene than something else; relating to sexual matters in a crude or offensive way.
The comedian's jokes became lewder as the show went on, shocking some of the audience.
Comparative: lewd
Superlative: lewdest
Lewder → The word 'lewd' comes from Old English 'lewd', meaning unlearned or ignorant, and the suffix '-er' (meaning one who). Therefore, 'lewd' refers to someone who is unlearned, particularly in a moral sense, and 'lewd-er' describes a person who is more so in that regard, often implying a lack of moral restraint.
Think of someone who is 'unlearned' or 'ignorant' in moral matters — that's why a 'lewd-er' is someone who is more so in that sense.