Senses
不要紧/ 不要緊 unimportant
not serious; not urgent; of little consequence
不要紧/ 不要緊 never mind
it doesn't matter; no problem; used as a response to an apology or to indicate no harm is done
不要紧/ 不要緊 it may not matter to you, but...
Used in the first part of a sentence to suggest that while something seems fine on the surface, it actually causes a problem or leads to a consequence.