diff --git a/src/util/yomitan/convertEntryToDetailedDefinition.js b/src/util/yomitan/convertEntryToDetailedDefinition.js
index 96a703a..b5a300f 100644
--- a/src/util/yomitan/convertEntryToDetailedDefinition.js
+++ b/src/util/yomitan/convertEntryToDetailedDefinition.js
@@ -2,6 +2,7 @@ import { convertHeadwordsToSC } from './convertHeadwordsToSC.js';
 import { convertSenseToLiSC } from './convertSenseToSC.js';
 import { createEntryAttribution } from './createEntryAttribution.js';
 import { createEntryImageSC } from './createEntryImageSC.js';
+import { convertEntryToSynAntsSC } from './convertEntryToSynAntsSC.js';
 
 /**
  * Converts a dictionary entry to a detailed definition.
@@ -15,6 +16,7 @@ function convertEntryToDetailedDefinition(entry) {
   const SCArray = [];
   // Headword
   SCArray.push(convertHeadwordsToSC(entry.headwords));
+
   // Senses with explanation/examples
   SCArray.push({
     tag: 'div',
@@ -30,6 +32,11 @@ function convertEntryToDetailedDefinition(entry) {
       content: entry.senses.map(convertSenseToLiSC),
     },
   });
+  
+  // Synonyms/antonyms
+  const synAntsSC = convertEntryToSynAntsSC(entry);
+  SCArray.push(...synAntsSC);
+
   // Image
   let imageURLs = [];
   if (entry.tags.some((tag) => tag.name === 'img')) {
@@ -39,6 +46,7 @@ function convertEntryToDetailedDefinition(entry) {
     }
     imageURLs.push(...validImageURLs);
   }
+  
   // Attribution
   SCArray.push(createEntryAttribution(entry, imageURLs));
   return {
diff --git a/src/util/yomitan/convertEntryToSynAntsSC.js b/src/util/yomitan/convertEntryToSynAntsSC.js
new file mode 100644
index 0000000..77a7cc7
--- /dev/null
+++ b/src/util/yomitan/convertEntryToSynAntsSC.js
@@ -0,0 +1,60 @@
+/**
+ * Converts an entry to a ul list of the element's synonyms and antonyms.
+ * @param {DictionaryEntry} entry
+ * @returns {import('yomichan-dict-builder/dist/types/yomitan/termbank').StructuredContent[]}
+ */
+function convertEntryToSynAntsSC(entry) {
+  let exists = false;
+  /**
+   * @type {import('yomichan-dict-builder/dist/types/yomitan/termbank').StructuredContent[]}
+   */
+  const SCArray = [];
+  /**
+   * @type {('sim'|'ant')[]}
+   */
+  const tagTypes = ['sim', 'ant'];
+  for (const type of tagTypes) {
+    const { SC, exists: typeExists } = convertEntryToSCType(entry, type);
+    if (typeExists) {
+      SCArray.push(SC);
+    }
+  }
+
+  return SCArray;
+}
+
+/**
+ *
+ * @param {DictionaryEntry} entry
+ * @param {'sim'|'ant'} type
+ * @returns {{ SC: import('yomichan-dict-builder/dist/types/yomitan/termbank').StructuredContent, exists: boolean}}
+ */
+function convertEntryToSCType(entry, type) {
+  const typeTags = entry.tags.filter((tag) => tag.name === type);
+  if (typeTags.length === 0) {
+    return {
+      SC: [],
+      exists: false,
+    };
+  }
+  let tagString = typeTags.map((tag) => tag.value).join('・');
+  return {
+    SC: {
+      tag: 'ul',
+      data: {
+        wordshk: `${type}-list`,
+      },
+      lang: 'yue',
+      content: {
+        tag: 'li',
+        data: {
+          wordshk: type,
+        },
+        content: tagString,
+      },
+    },
+    exists: true,
+  };
+}
+
+export { convertEntryToSynAntsSC };