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There's a whole area of algebraic graph theory, but without any information on a the graph, I can't remember anything graph specific right now

What is relevant is Gershgorin circle theorem

Which for example would mean that a undirected graph without loops, the adjacency matrix would have eigenvalues smaller than the maximum links degree of a vertex, that is |M|. M-1|. And for the Laplacian we should get something like 2|M|.

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There's a whole area of algebraic graph theory, but without any information on a the graph, I can't remember anything graph specific right now

What is relevant is Gershgorin circle theorem

Which for example would mean that a undirected graph without loops, the adjacency matrix would have eigenvalues smaller than the maximum links of a vertex, that is |M|. And for the Laplacian we should get something like 2|M|.