ありがとうぐらい言ってもよさそうなのに。

Thank you; Thanks

approximately; about; around; or so; to (about) the extent that; (almost) enough that; so ... that ...; at least; as ... as ...; like

to say; to utter; to declare; to name; to call; to go (e.g. "the alarm went ping"); to make a noise

too; also; in addition; as well; (not) either (in a negative sentence); both A and B; A as well as B; neither A nor B (in a negative sentence); even; as much as; as many as; as far as; as long as; no less than; no fewer than; even if; even though; although; in spite of; further; more; again; another; the other

be; is; indicates past or completed action; indicates light imperative

although; when; and yet; despite this; in spite of; even though; but even so; but even then; however; nevertheless; for all that; notwithstanding that; while; if only; I wish; I tell you; you should do; in order to