I have made some changes to get the full word. (not trim the word)

// Excerpt length
function custom_excerpt(){
?>
<script>
// trim sentence by 22 words
	function trimByWord(sentence,wordcount = 22) {
		var result = sentence;
		var resultArray = result.split(" ");
		if(resultArray.length > wordcount){
		resultArray = resultArray.slice(0, wordcount);
		result = resultArray.join(" ") + "...";
		}
		return result;
	}
jQuery(window).load(function(){
    jQuery('.post-entry').each(function() {
     	jQuery(".entry-content ").text(function(index, currentText) {
  
     		return trimByWord(currentText);
		 });
    	jQuery(".entry-title a").text(function(index, currentText) {
   		return trimByWord(currentText,15); // trim title by 15 words
		 });
    });
});
</script>
<?php
}
add_action('wp_head', 'custom_excerpt');

Hope it help you all!
Best