sincipital
Of or relating to the sinciput.

sindonological
Of or relating to sindonology.

sinecological
Misspelling of synecological.

sinecural
Of or pertaining to a sinecure.

sinergistic
Misspelling of synergistic.

sinewless
Having no sinews.
Lacking strength or vigour.

singable
Capable of being sung.

singalong
A gathering of people who sing together

singalongs
plural of singalong

singerlike
Resembling a singer.

singlecast
Having a single target; not multicast.

singlefold
Consisting of a single fold or undivided part.

singlehanded
Alternative form of single-handed.

singlehandedly
Alternative spelling of single-handedly.

singlehearted
Alternative form of single-hearted.

singleleaf
Having individual leaves that are not grouped into fascicles.

singleminded
Very focused; having a single goal, purpose, or idea.

singleplayer
played by a lone (1) player

singlestranded
Alternative form of single-stranded.

singleted
Wearing a singlet.

singletrack
A narrow mountain biking trail that is approximately the width of the bicycle.

singletracks
plural of singletrack

singleworld
Relating to the form of the universe in which the many-worlds interpretation of quantum mechanics is rejected.

singsongy
Alternative spelling of sing-songy.

singularist
One who affects singularity.
A proponent of singularism.
A proponent of singularism.

singularitarian
Alternative letter-case form of Singularitarian.

singulate
Pertaining to being single (not in a marriage).

singulative
Of or pertaining to a grammatical form or construction that expresses the individuation of a single referent from a mass noun.

singulatives
plural of singulative

sinical
of, relating to, or constructed using sines

sinistral
Of, facing, or on the left side.
Left-handed.
Having the whorls of the spire revolving or rising to the left; reversed.
Having left lateral fault movement.

sinistrals
plural of sinistral

sinistrogyre
Levorotatory.

sinistrolateral
On the left side of, toward the animal or human's left.

sinistromanual
Left-handed.

sinistroposterior
sinister and posterior

sinistrorotatory
Synonym of levorotatory.

sinistroventral
sinister and ventral

sinkable
Capable of being sunk

sinkerless
Without a sinker.

sinkier
comparative form of sinky: more sinky

sinkiest
superlative form of sinky: most sinky

sinkless
Without a sink (of any kind).

sinklike
Resembling or characteristic of a sink.

sinkproof
Resistant to sinking.

sinky
Into which one can sink.

sinless
Without sin; never having sinned.

sinlike
Resembling or characteristic of a sin.

sinnier
comparative form of sinny: more sinny

sinniest
superlative form of sinny: most sinny

sinny
Characterised by or characteristic of sin; sinful; guilty of sin; wicked.

sinoaortic
Relating to a sinus and the aorta

sinoauricular
Synonym of sinoatrial.

sinocarotidial
Relating to a sinus and a carotid artery

sinofied
simple past and past participle of sinofy

sinographic
Relating to sinography.

sinological
Of or pertaining to sinology.

sinonasal
Relating to the sinuses and the nose (or nasal cavity)

sinophone
Alternative letter-case form of Sinophone.

sinopulmonary
Relating to the sinuses and the lungs

sinorespiratory
Relating to the sinuses and the respiratory tract

sinorhizobial
Relating to bacteria of the genus Sinorhizobium

sinoscopic
Relating to sinoscopy.

sinotubular
Relating to, or between, the sinuses and the tubular part of the aorta

sinovenous
Relating to venous sinuses (usually the dural ones) and their related veins, as for example in cerebral sinovenous thrombosis.

sinsational
Both sinful and sensational.

sinterable
Capable of being sintered.

sintery
Like sinter.

sinthomosexual
Having no personal interest in the future of humanity because of one's (non-heterosexual, therefore non-reproductive) sexual orientation

sinuaperturate
With apertures situated in the sinuses (notches or depressions).

sinuate
To advance in wavy or curvy manner, to bend, to curve, to wind in and out

sinuated
simple past and past participle of sinuate

sinuatrial
Alternative form of sinoatrial.

sinunasal
Alternative form of sinonasal.

sinuolate
Faintly or minutely sinuate.

sinuose
sinuous

sinuous
Having curves in alternate directions; meandering.
Moving gracefully and in a supple manner.
Morally crooked; shifty.

sinupallial
sinupalliate

sinupalliate
In molluscs, having an indented pallial line or sinus.

sinupalliates
plural of sinupalliate

sinusal
Relating to the sinus.

sinusitic
Relating to sinusitis

sinuslike
Resembling or characteristic of a sinus.

sinusoid
A curve having the shape of a sine wave.
Any of several channels through which venous blood passes in various organs.

sinusoidal
Having the shape or characteristics of a sine wave.
Relating to any of several channels (the sinusoids) through which venous blood passes in various organs.

sinusoidals
plural of sinusoidal

sinusoids
plural of sinusoid

sinusonasal
Relating to, or situated in the sinuses and the nose

sinussy
Alternative form of sinusy.

sinusy
Resembling or characteristic of the sinuses.

sinuvertebral
Relating to, or connecting a sinus and the vertebra

siong
Very tough, challenging.

siphonable
Able to be siphoned.

siphonaceous
Resembling a siphon

siphonal
Resembling or relating to a siphon.

siphonapteran
Of, pertaining to, or characteristic of the order Siphonaptera of fleas.

siphonapterans
plural of siphonapteran

siphonate
Having a siphon or siphons.

siphoneous
Of or relating to the Siphoneae algae.

siphonial
Relating to a siphonium

siphonic
Of or pertaining to a siphon.

siphoniferous
Siphon-bearing.

siphoniform
Shaped like a siphon.

siphonless
Without a siphon.

siphonlike
Resembling or characteristic of a siphon.

siphonocladaceous
Of or relating to the Siphonocladaceae.

siphonogamous
Relating to siphonogamy

siphonophoran
Belonging to the Siphonophorae.

siphonophorans
plural of siphonophoran

siphonophorous
Of or relating to the siphonophores.

siphonostelic
Relating to a siphonostele.

siphonous
Having tubular filaments.

siphosomal
Relating to siphosomes

siphoviral
Relating to siphoviruses.

siphuncled
Having a siphuncle; siphunculated.

siphuncular
Of or pertaining to the siphuncle.

siphunculate
Alternative form of siphunculated.

siphunculated
Having a siphuncle.

sippable
Capable of, or suitable for, being sipped.

sipunculoid
Relating to the Sipunculidea.

sipunculoids
plural of sipunculoid

sir
A man of a higher rank or position.
A respectful term of address to a man of higher rank or position, particularly
A respectful term of address to a man of higher rank or position
A respectful term of address to a man of higher rank or position
A respectful term of address to a man of higher rank or position
A respectful term of address to an adult male (often older), especially if his name or proper title is unknown.

siree
Sir.

sirees
plural of siree

sireless
Without a sire.

sirenic
Resembling or relating to a mythical siren.

sirenical
Like, or appropriate to, a siren, i.e. deceptive;fascinating.

sirenless
Without a siren.

sirenlike
Like a siren (mechanical or electronic device).
Like a siren (mythical water maiden).

sirenomelic
Of or relating to sirenomelia.

sirnal
Relating to siRNA

sirobasidiaceous
Of or relating to the Sirobasidiaceae.

siroccoish
Resembling or characteristic of a sirocco.

sirree
Alternative spelling of siree.

sirrees
plural of sirree

sis
Clipping of sister.

sises
plural of sis

sisiphic
Alternative form of Sisyphean.

sismantic
Of or relating to sismance.

sissier
comparative form of sissy: more sissy

sissiest
superlative form of sissy: most sissy

sissified
Made like a sissy; effete.

sissyish
Like a sissy.

sissyphobic
Exhibiting or relating to sissyphobia.

sisterfucking
motherfucking

sisterless
Without a sister.

sisterlike
Resembling or characteristic of a sister.

sisterly
Of or characteristic of sisters.

sisyphean
Alternative form of Sisyphean.