What is another word for "possibly"?

Roget's Thesaurus (1911) lists these synonyms for "possibly": accessible, achievable, admit, agreement, and, anything, are, attainable, barely, bear, but, chance, compatibility, compatible, conceivable, contingency, contingent, credible, dice, distance, doubtful, effect, feasibility, feasible, haply, have, improbable, inter, just, likely, luck, marginally, may, maybe, mayhap, measurable, misericordia, obtainable, ours, peradventure.