10 letters

leisureful featureful pictureful diseaseful ∙ promiseful ∙ offenseful unmenseful expenseful purposeful ∙ reverseful remorseful ∙ misdateful ingrateful ∙ ungrateful ∙ despiteful ∙ unspiteful requiteful ∙ untasteful ∙ unwasteful disputeful behooveful reserveful feelingful meaningful ∙ unwrongful stomachful ∙ unwatchful ∙ bewitchful refreshful ∙ anguishful unloathful unwrathful unfaithful ∙ stealthful ∙ unslothful unmirthful unyouthful untruthful ∙ unfanciful unmerciful ∙ unthankful ∙ satchelful ∙ counselful unavailful unskillful ∙ misdeemful ∙ kingdomful dishpanful kitchenful disdainful ∙ prepainful passionful balloonful treasonful unscornful unmournful comournful worshipful ∙ prefearful slumberful ∙ shudderful slanderful thunderful blunderful uncheerful ∙ pitcherful ∙ tumblerful ∙ steamerful dropperful ∙ lighterful chapterful platterful ∙ unpowerful despairful ∙ succourful flavourful ∙ bottlesful barrelsful ∙ shovelsful ∙ teacupsful ∙ successful ∙ addressful prowessful unblissful ∙ pocketsful ∙ bucketsful ∙ basketsful ∙ bellowsful retreatful entreatful undoubtful ∙ neglectful ∙ respectful ∙ suspectful ∙ thicketful sleightful delightful ∙ unrightful ∙ sprightful ∙ insightful ∙ thoughtful ∙ conceitful ∙ unfruitful ∙ tormentful torrentful consentful contentful uneventful ∙ corruptful comfortful supportful unsportful unboastful ∙ earnestful wanrestful ∙ disgustful ∙ untrustful ∙ trolleyful overjoyful nurseryful

11 letters

amplexicaul ∙ unregardful dispeaceful nongraceful disgraceful ∙ pretenceful resourceful ∙ carriageful prestigeful ∙ unchangeful nonblameful overcareful ∙ pleasureful ∙ increaseful ∙ unpraiseful suspenseful ∙ pretenseful unreposeful ∙ universeful distasteful ∙ harangueful unbehoveful mischiefful unbeliefful dreamingful reproachful ∙ researchful ∙ dispatchful ∙ unthoughful overbashful strengthful ∙ unhealthful ∙ preyouthful nonfanciful unplentiful unbountiful unbeautiful ∙ overpainful teaspoonful ∙ overhelpful overfearful unwonderful laughterful unmasterful unprayerful thimblesful ∙ satchelsful ∙ pitchersful ∙ tumblersful ∙ droppersful ∙ plattersful ∙ distressful ∙ predoubtful misdoubtful ∙ conflictful ∙ unforgetful disquietful ∙ pamphletful unregretful affrightful ∙ unfrightful undeceitful unresentful ∙ uninventful contemptful distrustful ∙ mistrustful ∙ unsproutful unsorrowful

12 letters

disregardful ∙ semipeaceful mischanceful ∙ unpresageful challengeful unrevengeful ∙ unbeguileful ultracareful ∙ adventureful ∙ unremorseful ∙ warehouseful overgrateful unmeaningful unrefreshful overfaithful overyouthful semitruthful overtruthful overfanciful overmerciful suspicionful saltspoonful overmournful unworshipful ∙ characterful ∙ overpowerful teaspoonsful ∙ wineglassful ∙ insuccessful unsuccessful ∙ unneglectful unrespectful irrespectful unsuspectful undelightful ∙ foresightful ∙ uninsightful unthoughtful ∙ overfruitful complaintful restraintful overboastful overtrustful horseplayful

13 letters

unresourceful atmosphereful undistasteful nonmeaningful ∙ unreproachful ∙ overplentiful superthankful expressionful tablespoonful ∙ eyedropperful overmasterful ultrapowerful ∙ superpowerful ∙ watchglassful presuccessful nonsuccessful preneglectful disrespectful ∙ prethoughtful interfruitful discontentful ∙ wanderlustful undistrustful unmistrustful ∙ oversorrowful

14 letters

pseudofaithful tablespoonsful ∙ semisuccessful overneglectful forethoughtful ∙ overthoughtful temperamentful ∙ predistrustful wheelbarrowful

15 letters

semiamplexicaul reminiscenceful handkerchiefful dessertspoonful ∙

16 letters

unforethoughtful

Words with a ∙ are valid Scrabble words (SOWPODS word list)