唯恐

唯恐	wéi kǒng	for fear that / lest / also written 惟恐
唯	wéi	only / alone / -ism (in Chinese, a prefix, often combined with a suffix such as 主义 or 论, e.g. 唯理论, rationalism)
唯	wěi	yes
恐	kǒng	afraid / frightened / to fear