problematic (adj.)

• absurd
• ambiguous
• arguable
• baffling
• confounding
• confusing
• confutable
• conjectural
• contestable
• controversial
• controvertible
• debatable
• deniable
• difficult
• disconcerting
• dismaying
• disputable
• disputed
• disturbing
• doubtable
• doubtful
• dubious
• dubitable
• embarrassing
• enigmatic
• hairy
• iffy
• implausible
• inconceivable
• incredible
• indecisive
• intricate
• mistakable
• moot
• mysterious
• mystifying
• open
• perplexing
• perturbing
• precarious
• preposterous
• problematical
• puzzling
• questionable
• questioned
• refutable
• ridiculous
• sensitive
• speculative
• suppositional
• suspect
• suspicious
• tall
• thick
• thin
• touchy
• tricky
• unbelievable
• uncertain
• unconvincing
• undecided
• unearthly
• ungodly
• unimaginable
• unsettled
• unthinkable
• upsetting