possibly

perhaps

Expressing uncertainty

• maybeExpression of uncertainty
• conceivablyWithin imagination's reach
• perchanceArchaic word for maybe

probably · likelihood · chance · probability · contingency · unpredictability · indeterminacy · unknown · questionable · variable

potentially

With latent possibility

• optimisticallyWith positive expectations
• promisinglyIn hopeful manner
• conceivablyWithin imagination's reach

ideally · hopefully · aspirationally · encouragingly · best case · fingers crossed · with any luck

unlikely

Not apt to happen

• implausibleUnlikely to be true
• doubtfulUncertain of truth
• dubiousOf uncertain reliability

questionable · suspect · skeptical · unconvinced · incredulous · iffy · uncertain · unreliable · farfetched · debatable

hesitant

Slow to act

• unsureLacking confidence or certainty
• waveringShowing unsteady resolve
• noncommittalNot expressing clear opinion

ambivalent · equivocal · undecided · provisional · tentative · exploratory · cautiously · guardedly · on the fence

conjecture

Guess from limited facts

• guessworkConclusions drawn without proof
• hypothesisTestable proposed explanation
• theoryExplanatory set of principles

surmise · presumption · supposition · inference · estimation · prediction · extrapolation · postulation · scenario · guesstimate

if

Conditional clause marker

• providedSupplied or given
• dependingContingent on something else
• contingentConditional or representative group

unless · assuming · given that · in the event · should · supposing · granted · pending · subject to · in case

• chancechance, luck, lottery, dice, randomness
• Possibilitymaybe, perhaps, could, might, may
• uncertaintyuncertainty, uncertain, unknown, unsure, unclear
• Noncommittalneutral, undecided, on the fence, noncommittal, indifferent
• sentence adverbsobviously, certainly, probably, perhaps, maybe
• filler wordsum, uh, er, hmm, ah