1. Having a quality that provokes disbelief
   "gave the teacher an implausible excuse" 
2. Highly imaginative but unlikely
   "an implausible explanation"
   - farfetched

See also: implausibleness, implausibly, improbable, incredible, unbelievable, unconvincing, unlikely

Antonym: plausible

• appliance
• applicability
• applicable
• applicant
• application
• application form
• application program
• application-oriented language
• applications programme
• applicative
• applicator
• applicatory
• applied
• applied anatomy
• applied math
• applied mathematics
• applied psychology
• applied science
• applied scientist
• applier
• appliqué
• apply
• appoggiatura
• appoint
• appointed