difficult to catch

ambiguous fleeting illusory incomprehensible puzzling slippery subtle tricky volatile

baffling cagey deceitful deceptive elusory equivocal evanescent fallacious fraudulent fugacious fugitive greasy imponderable indefinable insubstantial intangible misleading occult phantom shifty shy stonewalling transient transitory unspecific

definite honest intelligible stable understandable

attracting confronting encountering enticing facing inviting