diff --git a/native/jni/src/suggest/core/dictionary/dictionary.cpp b/native/jni/src/suggest/core/dictionary/dictionary.cpp
index f88388c..0bcde22 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.cpp
+++ b/native/jni/src/suggest/core/dictionary/dictionary.cpp
@@ -99,6 +99,11 @@
     return mDictionaryStructureWithBufferPolicy->addUnigramEntry(word, length, unigramProperty);
 }
 
+bool Dictionary::removeUnigramEntry(const int *const codePoints, const int codePointCount) {
+    TimeKeeper::setCurrentTime();
+    return mDictionaryStructureWithBufferPolicy->removeUnigramEntry(codePoints, codePointCount);
+}
+
 bool Dictionary::addNgramEntry(const PrevWordsInfo *const prevWordsInfo,
         const BigramProperty *const bigramProperty) {
     TimeKeeper::setCurrentTime();
diff --git a/native/jni/src/suggest/core/dictionary/dictionary.h b/native/jni/src/suggest/core/dictionary/dictionary.h
index 10010b2..542ba72 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.h
+++ b/native/jni/src/suggest/core/dictionary/dictionary.h
@@ -81,6 +81,8 @@
     bool addUnigramEntry(const int *const codePoints, const int codePointCount,
             const UnigramProperty *const unigramProperty);
 
+    bool removeUnigramEntry(const int *const codePoints, const int codePointCount);
+
     bool addNgramEntry(const PrevWordsInfo *const prevWordsInfo,
             const BigramProperty *const bigramProperty);
 
diff --git a/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h b/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
index cda8940..e2771f9 100644
--- a/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
+++ b/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
@@ -74,6 +74,9 @@
             const UnigramProperty *const unigramProperty) = 0;
 
     // Returns whether the update was success or not.
+    virtual bool removeUnigramEntry(const int *const word, const int length) = 0;
+
+    // Returns whether the update was success or not.
     virtual bool addNgramEntry(const PrevWordsInfo *const prevWordsInfo,
             const BigramProperty *const bigramProperty) = 0;
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
index e323652..2e948ac 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_patricia_trie_policy.h
@@ -111,6 +111,11 @@
     bool addUnigramEntry(const int *const word, const int length,
             const UnigramProperty *const unigramProperty);
 
+    bool removeUnigramEntry(const int *const word, const int length) {
+        // Removing unigram entry is not supported.
+        return false;
+    }
+
     bool addNgramEntry(const PrevWordsInfo *const prevWordsInfo,
             const BigramProperty *const bigramProperty);
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
index 88bbfd9..dce9436 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
@@ -88,6 +88,12 @@
         return false;
     }
 
+    bool removeUnigramEntry(const int *const word, const int length) {
+        // This method should not be called for non-updatable dictionary.
+        AKLOGI("Warning: removeUnigramEntry() is called for non-updatable dictionary.");
+        return false;
+    }
+
     bool addNgramEntry(const PrevWordsInfo *const prevWordsInfo,
             const BigramProperty *const bigramProperty) {
         // This method should not be called for non-updatable dictionary.
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
index 1e10f24..aec3b8e 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
@@ -221,6 +221,11 @@
     }
 }
 
+bool Ver4PatriciaTriePolicy::removeUnigramEntry(const int *const word, const int length) {
+    // TODO: Implement.
+    return false;
+}
+
 bool Ver4PatriciaTriePolicy::addNgramEntry(const PrevWordsInfo *const prevWordsInfo,
         const BigramProperty *const bigramProperty) {
     if (!mBuffers->isUpdatable()) {
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
index d198c97..0a20965 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
@@ -93,6 +93,8 @@
     bool addUnigramEntry(const int *const word, const int length,
             const UnigramProperty *const unigramProperty);
 
+    bool removeUnigramEntry(const int *const word, const int length);
+
     bool addNgramEntry(const PrevWordsInfo *const prevWordsInfo,
             const BigramProperty *const bigramProperty);