"gave false testimony under oath"
"false tales of bravery"

"a false assumption"
"a mistaken view of the situation"

"a false start"
"a false alarm"

"false pretenses"

"delusive faith in a wonder drug"
"delusive expectations"
"false hopes"

"it isn't fake anything; it's real synthetic fur"
"faux pearls"
"false teeth"
"decorated with imitation palm leaves"
"a purse of simulated alligator hide"

"a suitcase with a false bottom"

"a false (or sour) note"
"her singing was off key"

"an assumed name"
"an assumed cheerfulness"
"a fictitious address"
"fictive sympathy"
"a pretended interest"
"a put-on childish voice"
"sham modesty"

"a false friend"
"when lovers prove untrue"

"he behaved treacherously"
"his wife played him false"