furtively — taken, done, used, etc., surreptitiously or by stealth; secret: a furtive glance.
garlicky — a hardy plant, Allium sativum, of the amaryllis family whose strongly, pungent bulb is used in cookery and medicine.
guardedly — cautious; careful; prudent: to be guarded in one's speech.
markedly — strikingly noticeable; conspicuous: with marked success.
perfidy — deliberate breach of faith or trust; faithlessness; treachery: perfidy that goes unpunished.
scarcity — insufficiency or shortness of supply; dearth.
sportingly — engaging in, disposed to, or interested in open-air or athletic sports: a rugged, sporting man.
startlingly — creating sudden alarm, surprise, or wonder; astonishing.
varsity — any first-string team, especially in sports, that represents a school, college, university, or the like: He is on the varsity in tennis and in debating.
Four-or-more syllable rhymes
accordingly — You use accordingly to introduce a fact or situation which is a result or consequence of something that you have just referred to.
alarmingly — causing alarm or fear: an alarming case of pneumonia; an alarming lack of respect.
assertively — confidently aggressive or self-assured; positive: aggressive; dogmatic: He is too assertive as a salesman.
diversity — the state or fact of being diverse; difference; unlikeness: diversity of opinion.
fraternity — a local or national organization of male students, primarily for social purposes, usually with secret initiation and rites and a name composed of two or three Greek letters.
imperfectly — of, relating to, or characterized by defects or weaknesses: imperfect vision.
infirmity — a physical weakness or ailment: the infirmities of age.
maternity — the state of being a mother; motherhood.
mercifully — full of mercy; characterized by, expressing, or showing mercy; compassionate: a merciful God.
paternity — the state of being a father; fatherhood.
surgically — pertaining to or involving surgery or surgeons.
vertically — being in a position or direction perpendicular to the plane of the horizon; upright; plumb.