Dasein only 'has' meaning, so far as the disclosedness of Being-in-the-world can be 'filled in' by the entities discoverable in that disclosedness. Hence only Dasein can be meaningful [sinnvoll] or meaningless [sinnlos]. That is to say, its own Being and the entities disclosed with its Being can be appropriated in understanding, or can remain relegated to non-understanding.
This interpretation of the concept of 'meaning' is one which is ontological-existential in principle; if we adhere to it, then all entities whose kind of Being is of a character other than Dasein's must be conceived as unmeaning [unsinniges], essentially devoid of any meaning at all. Here 'unmeaning' does not signify that we are saying anything about the value of such entities, but it gives expression to an ontological characteristic. And only that which is unmeaning can be absurd [widersinnig]. The present-at-hand, as Dasein encounters it, can, as it were, assault Dasein's Being; natural events, for instance, can break in upon us and destroy us.
And if we are inquiring about the meaning of Being, our investigation does not then become a "deep" one, nor does it puzzle out what stands behind Being. It asks about Being itself in so far as Being enters into the intelligibility of Dasein. The meaning of Being can never be contrasted with entities, or with Being as the 'ground' which gives entities support; for a 'ground' becomes accessible only as meaning, even if it is itself the abyss of meaninglessness.
P. 193-194