most acquainted (adjective) acquainted: aware
Sinonime: acceptance, accepting, assuming, belief, conjecture, expectation, fancy, guess, hunch, hypothesis, inference, posit, postulate, postulation, premise, presumption, presupposition, shot in the dark, shot*, sneaking suspicion, stab, supposal, supposition, surmise, suspicion, theorization, theory
Antonime: doubt,
unexpected