卤莽 is a variant of the more common
鲁莽 (lǔmǎng) — same pronunciation, same meaning, different first character.
鲁莽 is overwhelmingly preferred in modern Mainland writing;
卤莽 turns up in older texts and some Taiwan/HK contexts. CC-CEDICT marks
卤莽 explicitly as a variant of
鲁莽.
