Welsh terms whose use is typically restricted to casual, non‐ceremonious conversations.

The following label generates this category:informal (aliasesinformally,not formal)^edit. To generate this category using one of these labels, use{{lb|cy|label}}.

• Category:Welsh informal forms: Welsh terms that can be used in casual, non-ceremonious conversations as alternative forms of other terms.

• Welsh terms by usage
• Informal terms by language

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